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 October 25, 2015
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After receiving hand job and cumming on your own tummy parter rubs the cum into the tummy.
Bro this girl just gave me the gnarliest crabs Cum Tum.
by Kitchen daddy September 1, 2021
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When jerking off you finish on your stomach, not hers
Chad: did you blow your load on her tummy?

Kyle: fuck no, I pulled out of her and gave myself Cum Tum!

Chad: no you didn't

Kyle: (raises shirt) see, there's still a little cum flake in my belly button from cum
by Krocodilespundee406 November 23, 2020
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