center pocket 

a pocket located in the front of your jeans and usually lower than the side pockets. Also, it usually requires some digging and can only be accessed by a female.

Female: "hey where did you put my keys?"
Male: "In my center pocket. your welcome to go find them if you want."

center pocket by Tycho111 February 21, 2010

Rear center pocket

A butt hole

Hey, jackass, why don’t you take this here flashlight and jam it in your rear center pocket!

Rear center pocket by M.E.A.T June 8, 2019

back center pocket 

The anus (asshole) where some people will hide contraband or things they don't want found in their possession such as drugs.

I got strip searched at jail, but I hid my drugs in my back center pocket.

back center pocket by GayWhiteBottom4BBC May 23, 2018