[USENET: ascribed there to the TV series "Cheers" and "Moonlighting"]
1. To have sex with; compare bounce, sense 3. (This is mainstream slang.) In Commonwealth hackish the variant 'Bonk' is more common.
2. After the original Peter Korn 'Boinkon' USENET parties, used for almost any net social gathering, e.g., Miniboink, a small boink held by Nancy Gillett in 1988; Minniboink, a Boinkcon in Minnesota in 1989; Humpdayboinks, Wednesday get-togethers held in the San Francisco Bay Area.
3. Var of 'Bonk'; see bonk/oif.