A "loser" is someone who doesn't know what they have and fucks it up.

They are always making bad choices and fuck up their and everyone's lives around them.

They are Losers...

Also know as Dumb Fucks, Idiots, Fools, Dumb Asses, Dick Heads, etc.

Someone who puts a name on Urbandictionary.com and gushes about how people who are named that are the best

Apparently it's anyone who doesn't spend all his time and money at the bar every night, someone who doesn't feel the need to get laid every five seconds, anyone who doesn't make a million dollars a day, someone who's at home for more than two hours a day, anyone over the age of 12 who still lives at home with his parents, and anyone who's ever touched a computer or videogame.

A stereotypical term for one who doesn't fit into mainstream society, or is lacking friends. "Losers" are usually really funny, unique, or smart individuals who people neglect to try to befriend in fear that they themselves might be labeled as a "loser".

Someone who purposefully teases and taunts another for their own enjoyment.

Not a winner.