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1. rude slang With one's buttocks exposed. Good luck changing his diaper—he loves running around here bare-assed.
2. rude slang Completely naked. I can't believe he ran across the field without a stitch of clothing, completely bare-assed!
mod. with a naked posterior exposed; totally naked. (Usually objectionable.) He ran right through the room—totally bare-assed—looking scared as hell.