troll

Someone who is purposefully posting on a forum/messageboard/site sith the sole aim to irritate the regular members.

Contrary to popular belief there is much more to internet trolling than posting "OMG UR ALL SO GHEYYYY!!!1" "OMFG TRIVIUM SUX ASS U FAGS LOL" and the like. People who post such things will usually be one-post wonders and get banned, however the more experienced troll will attempt to cause some sort of havoc under the admins radar.

Common examples of trolling:
The long-term troll:
These guys don't mind waiting around for the fun to begin. They may pretend to be an average n00b, and give themselves the stereotyical interest(s) of the average member of said forum, then once having a few posts they will gradually try to spread dissent. This type may even pretend to be pally to the admin and get their msn (and try to crack their account password of course) whilst causing general disruption. May act under other proxies and slate these fake trolls on msn to the aforementioned gullible admin. These people, to be frank, usually have no life and love bringing message boards to their knees by putting considerable time into their carnage. If they crack the admins password the board is doomed.

The sophisticated troll:
This type will usually have some sort of distaste for whatever the said message board is discussing and try to cause annoyance as opposed to destructiveness. They will parody the members and see how much they can get over their heads. Subtle pisstaking being their route. They'll usually get banned in the end but will annoy an entire community using this drawn out approach.

The faker troll:
A clever troll, the main aim of the game is to, ironically, act really REALLY stupid, this trolls aim is to argue with members incoherantly, usually using text speak. This is a ploy, the troll only needs to spend 10 seconds writing the babble when the member wastes 10 minutes writing a much more wordy reply. The troll will reply with a stupid rebuff making the member post as many long replies as possible. Using the members weight against them and wasting their forum time... If they are good then their act will be believable and they probably won't get banned unless the admin is strict on txt tlk.

The rank and file spammer:
These are the first to pop into peoples minds, they are similar to the examples stated in the first paragraph. No previous experience necessary, this lot will swarm in, again, usually under proxies to maximise the destructiveness, and spam the place to hell. Only causes mild irritation if not in large numbers.

Join any popular forum for a year and I guarantee you'll see all of these.
(let's assume it's a metal board)

Faker troll (expecting to cause irritation):
"Hi im nu here u all seem kl i am rly metal rawrrr i leik slipnot and fall out boys!!!1 they r so metal! see u al on da forum xxx"

Rank and File spammer:
"LOOOOL U METAL PPL R SO GHEY WITH UR SHOUTY MUSIC WRIST SLITTING ANIMAL FUCKING SATAN SHIIIT"
by PsychoFox February 12, 2008
mugGet the trollmug.

trendy

A scourge which is arriving, in Britain anyway, not sure about other places...

Trendies are, on the surface, the "cool" people in their 20's, your stereotypical student, clean, almost "grown up" looking youths.

However in reality most are incredibly conceited, IMMATURE, arrogant, personality devoid, and nasty people, who are ridiculously cold to "ousiders".

With music and fashion they are infinitely malleable. They positively lap up the music MTV and NME Magazine dictates to them to like, however unlike the mallcore crowd, they do this activity shamelessly, and in the case of fashion, they wear what ghastly womens magazines/"lads mags" say is "hot" or simply what celebs (celebrities) like to wear, the latter are worshipped, especially if they tie-in with sport or the most popular television shows, the trendy will regurgitate the stupidest catchphrase from the stupidest show ad nauseum, until it's uncool to do so of course...

Quite possibly the most narrow minded group of people, and absolutely adamant about not letting others into their circles of friends, they'd rather be seen dead than seen being friends with someone with an "uncool" haircut, unless you match them exactly, trying to start a convo with one will be met with silence, blatent ignoring. This is contrasting to the crowd of trendies, which are, in most cases, as rowdy as they come. Although they rarely resort to physical violence the trendy has nothing but contempt for anyone out of the "norm", shouts to strangers who look different will usually be hilariously innaccurate, for example, calling people who wear heavy metal shirts, "goths".

A trendy is a walking set of contradicting philosophies which have been melded together by the media, the biggest contradiction of them all is thinking they are incredibly urbane and "grown up" when in fact they listen to pop music aimed at teenyboppers and, even worse, holding onto this attitude of "we are the cool kids and you are all sad geeks" into ages as ridiculous as their late 20's, something that most people outgrew before reaching teenagehood.

Everything which the masses like becomes part of every trendies outlook and philosophy, a trait they share with the poser, only instead of trying to get into a local clique or copying an idol they wish to be what they are dictated to be, along with the ever present arrogant-obnoxious personality, as someone said, they are quite possibly the shallowest herd there is, if it became "cool" to wear shit-streaked underpants on our head, the trendy would do this without even thinking about it.
Metalhead is 5 years or so younger than Trendy:

Trendy: Metal all sounds the same! I listen to decent bands like The Arctic Monkeys, The Fratellis...
Metalhead: No offence dude but I think that about the sort of bands you listen to, maybe I don't have an ear for that type of music, fair enough, I just know that metal like Korpiklaani and Freedom Call sound slightly different from TestAmenT and Razor to me...
Trendy: Whatever, you listen to your shitty shouting satan music then, the only good metal is System of a down.
Metalhead: They're ok, but they aren't metal.
Trendy: LOLOLOLOL!1 I bet <bands most well known song> is heavier than any of your... TestAmenT whatever... hahaha
*Trendy walks away*
Metalhead: *to self trying not to laugh* God... Trendies...

Trendy Girl: You should wear this.
Non-Trendy Guy: Why?
Trendy Girl: Because it would look hot.
Non-Trendy Guy: So, I should wear clothes I personally HATE, simply to be attractive to the opposite sex? How stupid...
*Trendy Girl tries to process the fact people can wear clothes THEY want to, fails, and walks off, her natural trendy instinct of getting away from the "loser" kicking in*

Trendy: Look at that idiot, his shirt looks so gay, who the fuck would wear a pink shirt?
*fast forward to when they are popular*
Trendy: *wearing a pink shirt like everyone else* Look at my shirt, it's "sick"... Pretty cool how I started the whole wearing pink thing around here.
*an arguement starts over who started it, the person they took the piss out of before would be conviniently forgotton. Also goes for bands they took the piss out of when not popular.(Trendies are the inheriters of Orwell's Doublethink)*

^ Above are practically real examples, sadly.
by PsychoFox May 26, 2007
mugGet the trendymug.