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Derived from the standard Harnish, a crusty Harnish is when someone with a moustache is fapping so fervently that he spunks so hard it splooshes into his moustache. In the heat of the fap session the jizz goes unnoticed for the rest of the night until his mother tucks him into bed with a kiss.
Jonathan flapped so hard he crusty harnished himself.
by ScummyHarnish May 25, 2016
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