Bawass, derived from the word bowels, is the act of a man getting his penis covered in feces during anal sex with the partner. The position of preference is usually in the bawasser sitting on the bawassee's dick to allow for easy flow of transport of feces exploiting gravity. This will also be better in terms of aim.
This girl just did bawass on my penis. My word, did it smell unpleasant.
This girl just bawassed on my dick and it's stinky as fuck.