boob knocking

When a topless or nearly topless woman's breasts are slapping together, caused by a back and forth motion during vigorous activities, such as sex or jogging

Slow down baby, I got some serious boob knocking going on here.

by Mouse3008 May 24, 2015

boob knocked

Boob knocked. To be boob knocked means to be smacked in the face with some large breasts so much so that a nipple shaped impression can often be left on one's cheek.

Anna, that really hurt when you boob knocked me in the kitchen last night, just look at my face.

by Bum face May 1, 2006