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.
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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.