When you do not wipe your ass correctly and small parts of shit are left in your anal hair that then harden resulting in the owner of said gruff nuts having to pick them out of the hair - usually the case with men or german women
OMG My ass hair hurts!!

You need to pick out your guff nuts Donovan!!
by urbanfoxx June 29, 2011
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gobbet of faecal matter, usually attached to hair close to the anus.
the prospect of 69 heaven evaporated as a guff nut hove into view.
by chumpflower December 16, 2003
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