Top Definition
An extremely obese man with a beard. Preferrably used in a derogatory sense.
"Jesus Christ did you see that Grizzly Fatums lookin' motha fucka back there? Swear to God the dude had a whole chicken leg stuck in that beard!"
by hopeagnsthope313 September 28, 2006
5 Words related to Grizzly Fatums

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