Crowning

You are currently pushing a fat turd out of your ass. You push the turd just far enough to where the turd is peaking its head from out of your butt hole.

The rim of your butt hole is now a crown around the head of the turd peaking its head out. Your turd is crowning, hence you are crowning.

My turd is Crowning, let me in the toilet before i explode.

I'm Crowning right now. Let me in the toilet before i shit my pants.