Kuck is a slang, often offensive term for a bodily discharge with traces of blood, usually menstrual related. If there is blood in your urine, that is kuck also.
Kuck can be a noun or verb by just adding -ing. (Kucking)
1) I went to the restroom and I had evidence of kuck in my pee.
2) Oh man, she kucked all over my face when I was eating her out!
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