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1.
a person who smokes weed or does drugs and does not hide it.
Person 1: Dude I was so fucking stoned yesterday.
Person 2: Wow man, your such an Arex.
Person 3: Seriously, I don't give a shit if you do weed 4 times an hour.
by sympathetiC LegacY December 18, 2009
 
2.
Slang for Anorexia Nervosia. Used mainly as an insult for friends who believe they are fat and opt to not buy/eat food.
"Thomas, what are you ordering?"
"Meh. I think I'll get a cruton"
"WTF mate? A cruton? what are you a fatass?"
"Don't call me fat!"
"You are fat you A-rex son of a biotch"
by David A. Sherman March 28, 2008