The accidental bumping of posteriors on the dancefloor, acknowledged as agreeable post-bumping. Typically non-verbal form of communication.
1: "How did you two meet, Tinder?"

2: "No actually we butnodded at a Carl Craig gig when Carl was closing with Fleetwood Mac. Next thing you know I was polishing his amygdala and he had his hand down my crack. We're naming our first born Stevie in commemoration of that moment."

1: "That's so romantic, I thought these butnods only happened to famous people."
by OnTheLam October 1, 2018
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