1. A person's buttocks or rear end.
Usage: slang; informal; vulgar
2. A suitcase, bag, or piece of luggage.
Usage: slang; dated

Examples

• He fell on his keyster while ice skating.
• The comedian made a joke about his keyster.
• She packed her keyster for the trip.
• The old vaudeville performer carried his keyster everywhere.
• Don't sit on that chair or you'll hurt your keyster.