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.
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.
The definition of "trendy" constantly changes because trends change too. What is in at one point often becomes yesterday's fashion very quickly. As such, there really is no set definition.
"Trendy" is often used in this day and age to describe young 18-24 year-olds (one of the most sought-after marketing groups) who follow fashion trends (sometimes even starting or perpetuating new ones), are technology-savvy, up on the latest modern/alternative music, and in general are part of a group of people who all follow these same trends.
Basically, a "trendy" person is abreast of all the latest trends, and follows or is at least aware of most of them.
But of course, this is only one definition...
Wankers, the lot of em.
Girls: Brown hair with blonde highlights, "Friends" hairstyles, retro shoes, big tacky white and teal square earrings, always obsessed about their hair/makeup/perfume/clothes/bags/music/friends/celebritys/tv programs etc..., they must do anything that will make them as popular as ever!
Boys: must have retro hair, must wear American sports shoes, and must listen to the Darkness, and be incredibly funny so the girls laugh stupidly, and flirt like whores.
These wannabes hate goths, punks, greebos and townies because they don't dress like them and therefore "are not popular enough"
For the male this normally involves slip on shoes, tight jeans and a shirt normally in a pastel shade or resembling your nans table cloth. His friend will be wearing the same but maybe a different coloured shirt if they are feeling adventurous.
They enjoy going into town on a saturday night to get drunk and then pick a fight with anyone on the way home.
The female, wearing various FCUK items, and looking like someone from Pop Idol, like her male counterparts, is often quite 'slutty' and brash and enjoys sex in alley ways.
Normally they have no individuality and the IQ of a Limpet with mental problems.
Person B: Jesus H Christ!