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A person, girl or boy, whom has previously given a man passionate oral sex (enough to make him jizz), but has forgotten to wipe one's upper lip, very much covered in luscious creamy semen, which is making merry with one's upper lip hairs.
Oi you cumtach! you made spill my tea!

Yes mate, she was a cumtach for a wholeweek!

Cumtaches!, Cumtaches!, Cumtaches all of them!

Micheal's was particular cumtached, because hadn't received his package in the mail
by Oxfordicktionary April 17, 2009
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