look up any word, like the eiffel tower:
when two females hug and their breasts meet before their arms
"What the hell?"
"Oh...sorry I didn't mean to boob slap you"
by fashionfreak March 03, 2009
when a girl uses her boobs to slap you in the face (must be a DD or bigger to work)
"jo's boobs were so big that they made red marks on your face after the boob slap"

by goddambats May 27, 2006
slapping the boobs, instead of butt slap and high fives.
Livia gave Addy a boob slap, and Addy screamed.
by Emma Dohorichik May 01, 2009