The juice(sweat)released between your balls and butthole, after a long days work.
Please wash your hands, I know it has butt chum on it.
by Cole B. October 23, 2007
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When you get a slimy and gooey substance on the creaks of your anus.
David Tong got loads of butt chum when he ate too many rice cakes.
by FreeDong2016 May 11, 2017
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