Top Definition
Accidental buttfuck means that you bent down innocently but accidentally in front of someone and their dick touches your butt.
Girl- "Oh I dropped my phone"
Boy- Walks forward while the girl picks up her phone. "Well she just got an accidental buttfuck"

I guess that's what it means. That might be completely false but whatevvs man.
by 420 LEM April 14, 2014

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