What does D CUP mean?
A woman's large breasts. implying bra size.
Other definitions of D CUP:
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How to use the term D CUP:
Don't let the D cup distract you she's a rocket scientist.
More slang terms:

YDEK
You Don't Even Know

CME
Checking my e-mail

S.W.A.K.
sealed with a kiss

Lid
Referring to one oz. of marijuana.