n. Slang A line in a play or film, for example, that elicits a big laugh: "He doesn't go for the big boffs, artificially inflated, but lets his comedy build through a leisurely accumulation of bizarre details” ( Vincent Canby). n. Slang A big laugh.n. Slang A conspicuous success. Also called boffo, boffola.v. To have sexual intercourse with.verb-intransitive. To engage in sexual intercourse.