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when your behavior towards your significant other resembles the way you would interact with acquaintances and co-workers.
Guy 1: My girlfriend was chumin' me all night.
Guy 2: How so?
Guy 1: when her friends came around she wouldn't even hold my hand and she patted me on the back when we hugged like she's my aunt or something.
by Durt McGavin January 10, 2008
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when a female is chumin she is currently on her menstrual cycle that consists of dark red blood and chunks like chum (like fisherman use to attract large fish or sharks by dumping buckets of fish blood and guts into the water).
feeeeeeewwwww!!! she must be chumin!!
by sam (batman) May 17, 2006
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