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(Noun) - A highly appealing abdominal region on a woman that causes an extremely strong desire in a man on which to ejaculate sperm.
It is not uncommon during intercourse that a man may achieve orgasm while in the missionary position. If he removes himself from the woman just prior to ejaculation, a frequent and convenient zone of fluid deposit is her abdominal area. A heightened level of satisfaction from performing this act can be attained by the woman having toned abdominal muscles, or at least having the appearance of such. Thus, the woman has a great stomach to cum on, or a "cumach".
Susie has been doing a lot of sit-ups. She has a total cumach now.
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The stomach ache a person gets after swallowing too much sperm during a blow job
Dude after I gave Johnny a b.j. I had such a bad cumach ache.
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When a man shoves his dick into somebody's belly button, by stretching it or having a small enough dick to fit in.
Callum: Yo, I stuck my dick in this girl.
Drake: You gave her a cumache?
Callum: If that's what it's called, sure.