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Noun. A man's metaphoricle (sandy) vagina, also used as a derogatory term to describe someone that is being an extreme douchebag or asshole.
Courtney: Carl made a mess at the party last night than got pissed and threw a tantrum when he was told to clean it up.

Ryan: what a scruntknuckle!

Used in a sentence: man! Carl was suffering from a severe case of scruntknuckleitis last night!
by Littlekeever March 12, 2017
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