Top definition
A rough wank that stretches and thins the penis shaft and gives a shiny purple bell end.
"Damn that woman has a strangle hold!!! She gave me Knob Wrench!"

"My dick looks like a cherry on a stalk after that Knob Wrench!"
by Eddie Grundie July 18, 2012
Get the mug
Get a Knob Wrench mug for your bunkmate James.