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When you're trying to make someone cum and you're doing everything that you can and using every trick in the book and they just can't/won't cum
I went down on a chick for two fucking hours and she just didn't cum.
She's "Uncummable"
Nickname for a person who can pump forever.
OMG! He is Ali Gorkem Yalcin aka Mr Uncummable.
When you are not able to cum during intercourse
Man I’m swear I’m uncummable these days
Unable to cum, or having difficulty ejaculating from genital stimulation
"Behold the uncummable cock! Wait your turn in line, one ticket gets you three tries! No one's ever succeeded!"