Internet meme started in the Dungeons & Dragons Online MMORPG first and then refined (mostly in form) in the DDO Forums.
The definition is hard to quantify. Some would call it a "slam" or some sort of "snarky" reply. While that can be true it is much more subtle than that. It's meaning is more of a feeling than anything else. How can one possibly define Love adequately? They can't, of course, and likewise, no one can adequately define Hi Welcome
Form: Just to review the form quickly, it should always be written with a capital H and a capital W. No punctuation is permissable either. It should always be written - Hi Welcome and no other way. If you're writing it in another language (and assuming the language has capital letters), only the first letter of each word should be capitalized and again no punctuation is used. The lone exception to the "only the first latter in each word is capitalized" rule is for the Chinese form not written in characters. In this case Ni Hao HuanYing is correct. This is due to a peculiarity of the Chinese language.
Here is one example:
Someone (most likely a n00b or a known forum jackass) has just given a long forum rant displaying a lack of experience, social adeptness, and most of all...intelligence.
You reply with: Hi Welcome
In this particular case it may mean, "Allow me to welcome you both with my literal words and with an active display of how much you fit in by being tone deaf, dumb, and uncritical of your babbling myself. Because anyone able to engage your arguments would rip them to shreds, the most sincere welcome you can get is from someone unwilling to do so as demonstrated by their simple vocabulary and punctuation and seeming lack of thought put into the response."
A woman that, on public forums, writes explicit sexual activity to men.
The slobberslut is the most popular woman on the forum.
A internet troll who tries to popularize conservative beliefs. Along with his counterpart and nemesis, the libtroll, he is the most poisonous of trolls
Hahaha! Obama's a soshulist! You are dumb! He is Hitler!OH, I guess I'll be called racist!
Shut up, conservatroll
A popular forum on a lameass anime roleplay site called GaiaOnline. The General Discussion or GD is filled with trolls, prommies, wannabe prommies, faggots, tween girls, sexy women, muscular men, nerds, trolls, spammers, weaboos, stoners, scenefags, and just about every other class of human. We go here and discuss our lives and get attached and then you find yourself pretty fucking addicted, making it impossible to leave.
Often seen topics:
she's soooo pretty PICDROP
wtf is this shit UGGODROP
my life sucks suicide note inside
TINYCHAT TIME !!!!!
i made another video for you guys viddrop
& other shit no one gives a fuck about
& then the occasional entertaining thread
& then sometimes even
The Birth place of trolls. A place where the trolls decieve other internet goers to come with their personal problems. Once there the trolls spring a trap on the OP and feed on its self-esteem.
Poster: I haz unibrow...
Troll: Shut the fuck up noob, tits or gtfo
Poster: Formspring sucks...
While hated by most, these people are typically non-social for reasons beyond their control, and manage to get that one glimpse at society by eliciting responses from forum-goers who, nine times out of ten, think they know everything and that anything that goes against the norm is bad. There are of course the assholes who do it just for fun, but a lot of these people are suffering: people with manic (or often just plain old) depression, people with real issues in real life, or people who's real life isn't as cupcakes and unicorns as people on the internet assume.more...
I say this because I know people in real life who many would consider trolls, and they "troll" on forums because they receive no attention from their family and very little from anyone else. They are saints for putting up with it in real life, but it'd be unhealthy to pent up all their frustration. So what do they do? They speak out on the internet, often in obnoxious and annoying matters. The very fact that people respond to what they say is important to them, just because they get satisfaction in knowing that some people somewhere acknowledge their existence, and perhaps more importantly their opinion. Believe me, most trolls you see aren't "a poor excuse of a human being". Their lives in real life is worse than many could imagine. Everyone needs to vent sometimes.