A game where you attempt to throw an object into a woman's cleavage.
If the woman is playing as well, the goal is to for her catch the object being thrown between her breasts. If the woman is not playing along, the goal is for the person throwing to make the object being thrown land in the woman's cleavage.
Despite common belief, it is usually played between women.
I was wearing a v-neck at lunch, and Amy didn't want her carrots, so we played Cleavage Catch.