Abbreviation of "gay bathroom sex". Sex carried out by two partners of the same sex(usually men) in a bathroom/restroom. To perform, the men remove their pants and the dominant male uses his p- . . . wait, what am I doing? I don't need to drag this out, you're not fourth graders. And if you are, get off this site you little perv, your mommy doesn't want you here.
I heard John and Stefan had GBS last night. They need a new sink.
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