1. The buttocks or rump; the posterior part of the human body when seated.
Usage: informal; chiefly Scottish or dialectal; often used humorously or colloquially

Examples

• He fell hard on his bittocks when he slipped on the ice.
• The child was sore in the bittocks after the long horseback ride.
• She landed on her bittocks with a thud.
• The old chair was worn thin from years of sitting on bittocks.
• He complained about his sore bittocks after the long journey.