When two males are disputing over who gets to fuck the drunk passed out girl at the party, they both take a leg and pull in opposite directions until one breaks. Whoevers leg breaks first is the one that gets to fuck her.
"Yo look at Patty she passed out! Dude, I'll wishbone you for it. You're on!"
v. To splitheadphones from the same audio device with someone else, so that one "speaker" is your left ear and the other is in the right ear of the other person.
My iPod just died on me, lemmie wishbone with you.
I saw you wishbonin' with Sara the other day, what were you guys listenin to?