bottom bitching 

When girls who live together sync up their periods, the one whose cycle they sync to is the "bottom bitch" who is faintly superior to the others.

I wasn't supposed to get my period til next week, but she bottom bitched me.

Some say bottom bitching is a good sign for new roommates.

bottom bitching by best_I_ever_had April 22, 2009

Bitchini Bottom

When someone asks where your going but you don’t like them

Or when you want to give someone a nick name.

“Where are you going that you can’t come to my party”

“Bitchini bottom beach”

Or

“Heeeey bitchini bottom”

Bitchini Bottom by Llama llicker July 27, 2018