A rare species of dinosaur that lurks flamboyantly on piano benches.
"After I played we had a truly trex moment in which he held my hand for 45 seconds and I looked into his beedy black eyes and felt all the emotion flow from me"
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While someone you know is incapacitated either drunk or just heavily sleeping take rubber cement and apply it to the entire front section of a bare chest and bring the arms up to the chest, hold firmly until the rubber cement dries.

When the unsuspecting victim awakes they will find themslves doing the T-Rex and just as pissed.
John was so drunk last night we T-Rex'd him to get a laugh, you shold have seen his hands flailing around when he woke up, he had no idea what had just happened.
by IETVTS2 October 28, 2010
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When a guy is sitting in class and gets an unexpected/unreasoned boner. After class is through, they need to stick out thier ass while walking in order to hide it. The apperiance is similar to that of a prehistoric Tyrannosaurus rex.
Matt: Did you see that Zach kid T-Rexing out of class!?
Keith: Yea man it was so obvious.
by Plug1990 April 18, 2011
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1. Dinosaur who was considered to be the most ferocious and dangerous. Has huge teeth and mouth and can eat anything.

2. Nickname for Fibert Bruce, a man who has the physical appearance of a dinosaur, with huge teeth and a big mouth. Has been known to eat anything in sight.
"Damn... T-Rex ate all the pizza crust we left out last night. What a fucking scavenger!"
by kilo May 30, 2003
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To deliver a set of three mushroom tattoos, thus resembling a dinosaur footprint (like you made with your rubber boots in the snow when you were a child).
She smiled up at me and I couldn't resist... so I gave her the ole' T-rex.
by Ryan-michael Lindsay October 10, 2004
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A person who is so cheap that they appear to have tiny little arms like a t rex dinosaur. Their arms are too short to reach their pockets and wallet or purse. More often a girl is a t rex or t-rexer. She will never reach down to her purse to offer to pay for anything.
Yo dawg that chick is such a t rex. Every time we go out she never offers to pay for anything.
by t-rex hater January 25, 2013
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A person who is a cheapskate or pennypincher. Like the dinosaur, this person's "short arms" prevents him or her from reaching into pockets to obtain currency.
"I was buying rounds of beer all night and that T-Rex never once bought me a drink!"
by Jason Marshall September 30, 2003
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