(ambitransitive, informal) To have sexual intercourse (with); to bonk.
Max was boinking Jane in the bathroom of the bar.
Think he's boinking her? 1997, Tim Burns, Tom Stern, An American Werewolf in Paris, spoken by Brad (Vince Vieluf):
Yeah, but you gotta have stories. I mean, I've had my share of losers, but you… you boinked the undead. 1998, Doug Petrie, “Revelations”, in Buffy the Vampire Slayer, season 3, episode 7, spoken by Faith (Eliza Dushku):