Reverse Brown Bag 

a fraternity trick where a pledge is blindfolded and order to perform sit-ups. Once the sit-ups have commenced, someone puts their bare ass in the sit up path so that the pledge gets a face full of brownie.

see also power sit-up, shit-up

Dude, Scooter just gave Tay-Tay a reverse brown bag! It was fucking hilaious!

Reverse Brown Bag by jorns March 17, 2004

Reverse Brown Bag 

A person with a highly attractive face and hair but very unattractive body. The term is derived from the opposite of a Brown Bag. Synonymous with Reverse Butterface.

"I thought that girl was hot from a picture of her face. Turns out she was a reverse brown bag."

Reverse Brown Bag by peadeyedblacks October 19, 2008