Going ass-to-ass with a partner and masturbating the other person through your legs.
After huffing paint, Shira and Danny babooned in the laundry room.
When a male places his scrotum and/or testicles on a partner's nostrils, and the partner proceeds to blow air through said nostrils like the top coming off a tea kettle. (A high pitched screech from either person is optional)
Yo, that slut Denise gave me the steamiest tea kettle last night.