blackasaurus rex 

a blackasaurus rex is a black guy that is so dark that you can't see him at night until he smiles

Passenger: Holy shit dude! did you see that? you almost hit that blackasaurus rex.
Driver: Yea its a good thing he smiled.

blackasaurus rex by Spanky AKA Thumbs September 30, 2007

Blastasaurus Rex 

Someone who smokes (or "blasts") weed all the time, or someone who has been smoking weed for a long time.

Eric used to be such a Blastasaurus Rex, but now he done got himself religion.

Blastasaurus Rex by Shit_4_Brains June 23, 2007

Blankasaurus Rex 

When you go one or more days of hounding girls without getting sex.

Have you seen that guy Kevin, he didn't get any girls last night. He's such a Blankasaurus Rex.

Blankasaurus Rex by DollarDele March 3, 2017