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1. A weirdo who is creepin' (made popular from "The Creep" by Lonely Island)
Geez, that guy was totally t-rexin'!!

Yeah, what a T-Rexer!!
by divinedork April 21, 2011
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2
The act of masturbation using the hand with all fingers pointed down, mimicking a T-Rex claw
Dude, you see that new Maxium? I was T-Rexin myself to that shit all night
by Ballsface778 July 02, 2010
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3
When someone gets so drunk they are beyond blacked out, and are so drunk that it is a state of mind, causing said person to hold their arms in a perched position like a T-Rex.
There has been some serious t-rexin the past few nights of partying.
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4
Bobbing up and down on the dance floor with your arms scrunched up to your sides mimicking a Tyrannosaurus Rex. The most fool proof dance move to grab the opposite sexes attention apart from the robot. If you add a growl to this dance move it will ensure you a phone number 60% of the time every time.
Friend: Wow, he's fine. How did you get that guy to ask you out?
Me: Totally started T-Rexin to Dubstep at the club last weekend
Friend: GTFO, I'm switchin up my robot moves
by NattyPatty0429 July 18, 2013
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