To squeeze one's anal passage while in the process of taking a shit of enormous magnitude, resulting in the log being cut into either two or several chunks.

This would occur if the person was scared, starttled or just needed to hurry up and carry on when they get to a suitable location to finish the job.
Women: "Come back to bed baby."
Man: "Silence sex wench!"
Women: "We can do anal.."
Man: *Starts pinching off a loaf*
by Bible Author June 10, 2014
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Take a dump. Poop. Defecate. Drop a load. Cut the crap.
A: "ugh, I think I need to pinch off a loaf"

B: "what?! you need to chipoffolo?"

A: "NO DUDE!! I said: PINCH OFF A LOAF!"

B: "Oh (pause) what the hell?"
by Metso July 11, 2008
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Slowly tightening a hose clamp around your own testicals till the fall off
Dave can't make it to the party he's in the middle of an African pinch off
by Vfhbl September 3, 2015
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When your driving to Atlanta and hit a guard rail after a deer ran passed you on the highway and upon impacting the guard rail, the deployment of the airbag causes you to shit your pants.
I was driving to a tinderella in ATL and I totally ended up pinching off an Ian
by Killpulse October 2, 2018
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