Top Definition
The cleavage visible from the bottom of a shirt. See cleavage; of the bottom variety.

In sex, the cleavage most likely to be the initial point of entrance for titty fucking.
The girl's shirt was cut low enough to show her bottom cleavage.

Hey look at bottom cleavage girl, she's almost falling out of the bottom of her shirt.
by longplay14 June 06, 2011

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