A toilet prank, whereby someone defecates in the refill tank (water closet), causing each additional flush to deliver brown, poopy water into the bowl.
Jim was being such a jerk at his party, so I went upstairs to his bathroom and dropped an upper decker in his toilet.
In prison, the act of concealing objects in your anus or in the crack of your ass.
-Yo, Bill. How did you get those cigarettes in here, man?-
-I keister stashed 'em, dude.-
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