Top Definition
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
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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