Webster's Revised Unabridged Dictionary · 1913

Professional cant; the chatter of conjurers to divert attention from their tricks; hence, jugglery. [Colloquial]

Illegal or unethical behavior, usually surreptitious; as, the boss got suspicious when profits seemed lower than expected, and hired an investigator to see if any hankey-pankey was going on. [Informal]

Extramarital sexual relations, especially adultery. [Colloquial]