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When someone is constipated after having sex because of swallowing too much cum.
Girl: Doctor I have a stomach ache. Doctor: Did you have sex the past day? Girl: Yes. Doctor: It sounds like a classic case of cum tum!
by Stonewoof December 20, 2015
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2
Semen on one's stomach. The resulting state whilst having unprotected sex, when your partner pulls out and ejaculates on your abdomen.
I really need to get on the pill, John has totally been pulling the ol' cum tum.

unprotected sex birth control lazy
by tezbuh June 08, 2009
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