Top Definition
The growth in between a fat mans balls and his bum hole.
1-
Terry: Oh man, that's fuckin sick!
Nathaniel: What?
Joseph: Shit Nat, your sir-fingus is hanging out.
Nathaniel (embarassed): You guys man...

2-
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

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×