Top Definition
When a woman's breasts are busting out of her shirt, the cleavage is the size of a Pontiac Bonneville.
AJ: OMG! Did you see Britney's cleavage on tv?

Devin: Ya man, she had some Bonneville Cleavage goin'on.
#cleavage #bonneville #boobs #britney #bodacious yum yums
by Avreage Joe December 06, 2008
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