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ass grass 

The hair on a person's ass.
He really needs to shave that ass grass off.
ass grass by TrevDawg October 14, 2003

Ass grass 

Ass pubes
Ass grass by Hossengrassen January 15, 2023

Ass Grass Sandwich 

When someone slices the hairs surrounding the anus and inserts them between 2 pieces of bread.

Often carried out by a male forcing a female to "eat his ass grass sandwich"
Ass Grass Sandwich by Anonymous February 11, 2003

Your ass is grass 

Your precious buttocks has now become the center of a very farcical taunt. This phrase implies that "you are going down" in the near future. This phrase being said to you means that your inevitable fate is nearing. It is only half of the full sentence "your ass is grass and i'm gonna mow it." Basically someone is threatening you and you better get the hell outta dodge.
"You fucked my wife enough times Todd, your ass is grass!"

your ass is grass and I'm the mower 

Approximates to: You just fucked up big time, and now you're answering to me! Originated in the military.
Commanding Officer: You tried drifting a Humvee till it went Tango Uniform and then blamed it on your bunkmate?! Your ass is grass, boy, and I'm the mower!