also known as a slut. coming from the two words.

1.Cum - the sticky semen that you ejaculate from your penis
and
2.Bin - a place to store rubbish or semen in this case
urgh that dirty cumbin Meena has had everyone in croydin. i wouldnt touch her with a bargepole
by dox89 October 04, 2006
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The mixture of male semen and female vaginal fluid left on the sheets after unprotected intercourse.
After we finished and I rolled over she bitched about having to lay in the cumbination.
by webster2.0 May 17, 2011
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When you and your partner climax at the same time during sex
The sex was amazing due to the achievement of cumbination!
by cumrollplease March 29, 2017
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when you aggressively ejaculate into the end of a combine harvester to make the crops grow faster.
Lacey: Did you see how tall Joe's crops were?

Kendra: Yeah, he used a Cumbine Harvester!
by JoJoSiwaFanBoy666420911RIPXXX January 23, 2019
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it is delicious cum and cumber mixed with some bin and PEENUR. It is good. yummmmmmmmmmmm peenur good.
omg his cumbineer head tastes good. UWUWUWUWUWUWUW it is warmmnp
by MEMEdogeGOOD November 11, 2019
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When two men cum into the same woman
(Threesome)
Man 1: ACK! I'm about to cum!
Man 2: Me too, bro!
Woman: CUM IN ME
Man 1 and Man 2: It's time for a cumbination!!!!!
by thermal_blade July 13, 2020
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