Short for bonosaurus. An swelling of the male member by the circulation of blood, also known as an erection. Used to refer to an erection in public.
1. You see that girl? She got major hotential, and gave me a massive b-rex.
2. Damnit, why did i wear sweatpants today! Now everyone can see my massive 8 inch b-rex!
A girl, with a blow job factory for a mouth, who brings both hands to her chest when she's drunk and walks around like a dinosaur.
Damn, look at Brittani, fuckin B-Rex in the house!