noun
- the buttocks or rear end of the body
Usage: informal; slang; North American
Examples
- He fell flat on his keester while ice skating.
- The coach told him to get his keester in gear and run faster.
- She kicked him in the keester as a joke.
- He was so tired he could barely get his keester off the couch.
- The kids were laughing and slapping each other's keesters on the playground.