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2.
when two females hug and their breasts meet before their arms
THWAP.
"What the hell?"
"Oh...sorry I didn't mean to boob slap you"
by fashionfreak March 03, 2009
 
1.
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
 
3.
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