Smarmosaurus Rex 

An alpha breed of Smarmosaur that specializes in being a jerk who tries to get suave with the ladies, but fails due to him not realizing he is coming off as an idiot.

" See that guy Gavin over there? He's known as the Smarmosaurus Rex, he's the only guy who tries that hard to get suave with all the ladies. He's not very likable since he ends up being insincerely ingratiating.

Smarmosaurus Rex by Bewnam Ajnin April 20, 2008

slamosaurus rex 

a up and coming preppy ugly chick that will go out and look for whatever she can get

dude that girl is such a slamosaurus rex, who let her into the party

slamosaurus rex by inceptisizor December 13, 2010