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1 definition by PowBlocks

To have Unprotected Gay Butt Sex.
Richard: The inside of your ass feels amazing against my unprotected penis. I'm so glad we decided to have UGBS instead of using a condom!

Damon: And your unprotected penis feels fantastic when it pounds against the walls of my inner anus. This feels even better than the UGBS that gave me aids!
by PowBlocks May 20, 2007