Top Definition
The growth in between a fat mans balls and his bum hole.
Terry: Oh man, that's fuckin sick!
Nathaniel: What?
Joseph: Shit Nat, your sir-fingus is hanging out.
Nathaniel (embarassed): You guys man...

Bob walks out of his front door naked.
Next door neighbour: "Hey Bob, ur sir-fingus is flopping around."
Bob: "yeh, cheers mate"
by Fuckenhowzer May 17, 2007
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