Booty Brush
When a mans beard brushes against a woman's anus (intentionally and unintentionally) during oral stimulation of the genitalia; cunnilingus, fellatio.
He wanted to shave his beard but I told him not to get rid of the booty brush.
Booty Brushing
The step before grinding. When a girls butt is all up in a guy's "you know" in the context of dancing.
They were "Booty Brushing" at prom because they were just friends.
booty brush
When somebody accidentally walks past you when you are sitting, brushing their but across your face.
Molly booty brushed my face today in class. Best part of my day.