Acronyms

[Stratofortress]

Use acronyms and change their meaning. You can also use funny phrases
Start:

AFK - A Free Kill
ROFL - Russian Organizaion for LumberJacks
ACRONYM  - Abbreviated Coded Rendition Of Name Yielding Meaning
ASS - Atari Secret Society
CIA - Cocaine in America
PWNED - Programmers With Numerous Extraordinary Designs

[Ad Bot]

[Aloshi]

PIE - Physically Intelligent Eggs...

[Inaxio]

LOEL - Like Opium Eggs Living

[Metalhed]

LULZ- Loaded Underground Looter Zebras?

[Illidan]

BRB - Bitches Rubbing Boobies

[Metalhed]

BRB - Boobies Rubbing Bitches

[Illidan]

BRB - Boobies Rubbing Bitches

Only in Soviet Russia, my friend.

[Monty]

TWAT - Tuesday With A Twist.

[Spation]

You do realise it is only an acronym if it is pronounceable, like CAB. It can be said

BRB contains no vowels or anything of that nature. The pronunciation of it is impossible/arguable.
If it is the latter then it is just an abbreviation.

[Metalhed]

Bite- Bithes In The E-tard

[Deathloc]

This one is Real

WTF- World Tae Kwon Doe federation

[|Shadow]

 OMG - Old Mouldy Gold   ;D

[Falcondude]

Everything you've ever seen as the MotE server name.

[Starcraftman]

ROFL: Raping old fat lady's

[Colten]

orly- old rioting lardass's yelling