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1.
to call something false in an over bearing tone, also can be symbolized with the hand motion of a single pointer finger in the up-ward direction moving toward the false person, but can be overturned with a "fallz fallz", if the person that is fallzed feels he/she has be incorrectly fallzed
"dude i hooked up with that chick last night" "Fallz...i saw you passed out on that car last night"
by Nick Frat July 24, 2006
 
2.
Commonly used term meaning "fall in" in Runescape. Mostly used by pre pubescent fagkids to indicate that they are teh shit by calling fallz.
Pker1: My team, Fallz!

Pker2: fk u fgt fk
by bakedtaters November 18, 2010
 
3.
dominent player on the greatest game of all time MODERN WARFARE 2. also part of the most badass, feared, nd generally hated (for being the best) clans \X/. known for raining down missles nd calling in pave lows. some1 not to be fucked with.
guy#1 dude i was playin modern warfare 2 last nite nd this motherfucker FALLZ83 that was part of the \X/ clan. was in the room too

guy#2 yeah nd wat happened?

guy#1 the guy killed me 15 times! everytime i spawned he was there to kill me. i was so pissed off i turned off my ps3

guy#2 damn that sucks. remind me to stay away from those guys!
by weapon \X/ August 31, 2010