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Related to keester: keister
slang The buttocks or anus. Often used figuratively. OK, kids, get off your keesters and go play outside! The people in charge will keep sitting on their keesters and nothing will actually change. You can take all that phony-baloney nonsense and shove it up your keester!
keesterand keyster and kiester (ˈkistɚ)
1. n. a chest; a suitcase. The old lady was hauling the most enormous keester.
2. n. the buttocks; the anus. Get your keester over here!