laugh (one's) ass off(redirected from Laughing Their Asses Off)
Also found in: Acronyms.
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laugh (one's) ass off
rude slang To laugh uproariously or hysterically. Your jokes are perfect for your speech tonight. You'll have them laughing their asses off! I'm telling you, Mary's boyfriend is hilarious! He had me laughing my ass off when I met him.