1. A safe; a strong-box inside a safe. "Easy on the soup (crude nitroglycerine) with that keister or she'll jam (the tumblers will get out of line so that the safe cannot be opened)." 2. A satchel, or bag, especially a burglar's kit. "Ditch that keister. It draws heat (attract police attention)." 3. A small county jail; a local jail. 4. The buttocks. 5. Luck. "What a keister you got, making parole the first time up!."

- american underworld dictionary - 1950

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