1 definition by thesuperbirdman

Top Definition
A wank performed in a standing position whilst inserting your thumb into your ass
i walked in on my brother the other day and he was stood on the bed having a wank with his thumb up his arse. he just turned around and said "fuck off! i'm trying to have a fudgie bum wank"
by thesuperbirdman July 24, 2009

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