Plumber's Trumpet

This is a sex act is performed when your mouth and lips are placed upon your male partner's anus and you blow into their anus while wrapping your arm around the other side and tapping your fingers upon their erect penis like it is the valves of a trumpet. The desired effect is your partner will yell or scream making them the noise for the trumpet you have just played

Person 1:Yo bro you have some chocolate on your lips

Person 2: That's not chocolate I was just giving Tom a Plumber's Trumpet