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1.
When a man sticks his penis in between a woman's breasts and thrusts to create friction, like sex.
Man, those huge tatas would be great for breast sex.
by MiamiFinFan4Life November 19, 2004
 
2.
sex using the females breasts on either side of your cock.
also known as titty fuckin.
i was titty fuckin my ho cus the beaver was bleedin. sounds better than; my significant other and i were enjoying some breast sex because aunt flo was in town.
by i am smoke October 06, 2005