v. int. The act of pushing one's face in between two ample breasts, and rocking one's head side to side very rapidly while making a vigorous, lip-vibrating "brrr" sound.

n. The sound produced when doing a motorboat.

to bury ones face in some giant jugs and shake your face back and fourth while blowing out, and making a hubababa sound.

The act of sticking your face between a pair of ones breasts and shaking your head violently while making noices that resemble a moter boat.

To submerge ones face in large breasts and moving your head back and forth, flapping your lips, in turn making a motorboat sound.

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When you blow a raspberry in between a girls tits, making a motor boat sound

A male or female who places their head between a female's breasts and shakes back and forth while humming, producing a sound similar to a motorboat in water.