People think that they are cool when...
They do things like....
Replace letters for numbers.
ie: 7=T, 3=E, 0=O, 4=A, etc....
Make lamed abbreviations for longer words.
ie: leet, like eleet, like elite.
Use z's in place of s's.
ie: Hackerz, Crackerz, ownz, etc...
Use different spellings of words.
(like spelling them how they sound)
ie: you=joo, kewl=cool, etc...
Use lame combinations of the above.
ie: Pl4y3r 0wnZ J00
Instead of thinking up cool new things to say, they just think of different ways to say, or type in this case, the same old dumb, lame, un-creative sh1t they always say. Anyone who calls them selves l337 is prolly far from it. they just think they are cool 'cause they are in a clan, or got a godlike against a bunch of newbies in a game in which they grabbed 9 sheild belts in a 10 minute game.