The Five-Finger Dieter is what happens when a man can fit his entire hand into his ass, which is why the words "Five-Finger" are included in the name. It is an act of self-fisting, basically.
The word "Dieter" is a noble German name, and German acts of sex or masturbation are usually messy and acrobatic, which is why you need some flexibility to successfully give yourself a Five-Finger Dieter.
"Bro... I gave myself a Five-Finger Dieter last night!"
"You're gross man... But good job..."
by Ricky Biff and Little Peter November 14, 2020
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