Bumming "y"
A variation on standard bumming procedure. The two bummers in this case stand back to back, then both bend forward a little to create the bumming y. This seems to be based on the misconception that you can bum someone's bum, using only your bum. Or that bumming is the application of your bum to anything (including other bums), and not sticking a dick up one. Charming, but naive.
written by sp*rky *.., approved by Log

Hmmm, I would've thought that a bumming y would involve someone getting bummed by two people at once... The person to be bummed would bend over and touch his toes. The bummers would bum side by side, keeping their legs behind the bummee and leaning their upper bodies out on either side. Now that I think about it, this may not be physically possible. But at least it's proper bumming.
written by Ha*na* Pet*rs*n, approved by Phil

When I were a lass, "Bumming" also meant only to hit someone with the arse, not the greasy anal violation we take it to mean now. For example, "I bummed my sister so hard in the face that she fell over and broke a tooth." Brilliant!
written by Ch*rry*Gree*, approved by Ponky