look up any word, like the eiffel tower:
 
1.
add it to the end of anything to give emphasis that this person does it too much or too anything

Or at the end of a name to show how big they are

Rex is also added to the end to give more emphasis
I was yak-asaurus-rex last night, don't remember much.

Do you know Craig-asaurus? That niggaz huge.
by Jizzo Fortanel July 20, 2009
 
2.
Used to emphasize how absurdly big some thing is, or a feature that dominates someone personality.
"Ginny is a Cuntasaurus rex"
"Oh yeah! The biggest cunt I ever met, and her friend Jill is a Slutasaurus"
"She really likes her men to have a cockasaurus"
by JilltheSlutasaurus February 12, 2012