booty card 

A credit card for buying gifts for women so you can get a sexual favor in return.

I used my booty card to buy Laqueesha a diamond ring, and we had sex all night in return.

booty card by Stifler March 17, 2004

cardboard booty 

When a girl has an ass as flat as cardboard...

Look at Chloe, she has a "cardboard booty".

cardboard booty by Klymaxed March 10, 2016