Top Definition
n.,v. An act of anal-intercourse with someone who has not wiped their ass properly, thus forming a crusty brown layer over their anus, which crumbles with each thrust.
n. "The old homeless man was a good crumbfuck"

v. "I will crumbfuck my little brother tonight."
by Benjamin Liu November 26, 2003
3 Words related to Crumbfuck

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