The resulting fuck stain left by a friend when he or she comes over to your home and bangs some skeezer or wanker in your bed or on your couch.
Mamubean left quite a chum stain on my sheets after I let him house sit for the weekend.
by Hugh Jweener August 18, 2008
the stain left behind from having sex while the female is on her period
i pulled it out and cockslapped her, leaving a chumstain on her chin.
by boogyman222 January 30, 2006

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