Top definition
Literally, Boys Screwing Other Boys. Can be a noun or verb.
Do you participate in bsob?

He does bsob frequently and enjoys it very much!
by Ushio November 16, 2007
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug