Usually a type of kiss that is from lips to cheeks as opposed to anywhere else, though it can also apply from lips to any part of the body. In short, it would mostly be known as kissing on the cheek.
I want to give Jennifer Lopez and Eva Mendes many chummis.

I have given a lot of young women and little babies so many chummis.
by Angel Hunter December 11, 2008
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Chummi is slang for cum. "Having a chummi" is having an orgasm.
I just had a chummi all over your breasts. This means I orgasmed sperm on you.
by Frank Nowak October 20, 2007
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