Keister's Gambit 

"Keister's Gambit" is a fairly common technique used by many experienced board and card game players that consists of stuffing one's arse with one or more desirable game pieces prior to the beginning of the game, then discretely extracting them as needed during the game to replace less desirable game pieces, which are quickly shoved back in. A skillful player can usually remain undetected, except for the occasional brown smudges that sometimes appear on the extracted pieces. Some practitioners of Keister's Gambit recommend an ice cold enema and a sound spanking before "loading up".

The only reason I lost the poker game was because my opponent repeatedly played Keister's Gambit, ruining my entire deck in the process.

Keister's Gambit by Benevolent Deity February 21, 2018