funny business:

Coy figure of speech used by children and adults alike for sexual-behaviors that are or are thought to be forbidden or clandestine. See copulation for synonyms.
See Also: ass business, business, chamber of commerce, enviable disease, flesh trade, in the biz, in the business, in the line, itchy-scratchies, lap bugs, on the block, on the business, sinful commerce, souvenir, TCB, too funny, tough shit!, tough titties!

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