verb

• (slang) To have sexual intercourse with (someone).
  "Deke and LaVerne could go out to Cascade Lake together and plow the back forty all night; he would not be delighted with the knowledge that they were boffing each other's brains out, yet neither would he be surprised."

noun

• (entertainment, slang) A big laugh.
• (entertainment, slang) A line in a film etc that elicits such a laugh.
  "[Churchy, directing a comedy:] All right, Albert, here's your boff gag... You say, "What's that in the road a-head?" [Albert, actually seeing one:] A head! A head in the road! [Churchy... eventually seeing it:] Stop clownin'... This sure-fire joke is serious—you got the line all... wrong?"
• (entertainment, slang) A great success; a hit.

noun

• (slang, derogatory) A pupil who works hard; a swot.

verb

• (slang, transitive) To hit; to strike.
  "[…] something he'd found out the hard way when he was dating Kimberly Haney back in high school and her brother, Chad, big linebacker on the Roosevelt Roughriders football team, had taken exception and boffed him upside the head."