A big dirty monster skankface hoe; a prostitute. Derived from the song "Coochie Shorts."
Random guy 1: Man, that Coochiesaurus-Rex was at your house last night.
Random guy 2: That wasn't a Coochiesaurus-Rex that was my sister!!
Random guy 2's sister: Well you didn't say I was a Coochiesaurus-Rex last night!
Random guy 1: Oh snap! That was you?!?