When someone’s face is being slapped by two dicks simultaneously or in an alternating pattern. Not to be confused with Broderboat. Broderboat instead is where someone is holding two dicks beside their mouth and alternating their lips backs and forth on the dicks resulting in a “der-der-der-der-der-der-der” sound.
v. int. The act of a man pushing one's face in between two ample man-breasts, and rocking one's head side to side very rapidly while making a vigorous, lip-vibrating "brrr" sound.
When one paces their lips between the recipients butt cheeks and blows continuously creating vibrations and a wind tunnel. Butterboat! PLPLPllplplpLLPLPpllPLLPLLPll!!!!