crank it up and rip the knob off

An 80's term meaning to crank up the volume on a boombox and rip the knob off so nobody can turn it down.

Boombox: (song starts playing)
Guy: This is my favorite! Crank it up and rip the knob off!

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knob me off

This means to suck a mans penis.

Guy 1: I'm gonna see if that hot girl over there at the bar will knob me off tonight. Guy 2: Hey bro do you think she will do me too? Guy 1: Go find your own.

Knob off

To go somewhere.

I need to knob off into town.

I'm just knobbing off out.

Where's Pete gone? He's knob off to Benidorm for the weekend.

Right, I'm finished for the day, so I'm knobbing off home!