noun
the act of displaying one's bare buttocks as a prank or disrespectful gesture
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The act of mooning in public is considered indecent exposure and is illegal in many places.
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I can't believe he got caught mooning the neighbors from his bedroom window.
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We were just joking around and he ended up mooning us at the party.
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Her mood was so bad, it was like she was metaphorically mooning everyone around her.