1. Something you have hidden up your ass. Most of the time when your hiding it from authority. After you keestered something, whats in your ass is your ass stash
Example: Prisoner #1-You still got that ass stash?
Prisoner #2-Yeah, I keestered that shit. We got some weed for later.
1. To stick something up your to hide it. (Especially in a hurry)
2. When you have to much of something, its a suggestion to get rid of it
1. Prisoner #1-Hide that shit fast!
Prisoner #2-Nigga how?
Prisoner #1-Just keester it!
2. Person #1-Damn, we got to much _______ (fill in the blank with anything you want)
Person #2- Just keester it bitch