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 by grassy ass lover 1234 December 28, 2016

Your ass is grass 

1.You're dead fool.
2.You better watch it cuz you don't know who you are messing with.

Joe: You are a slut.
Stacey: Say it again and your ass is grass.

Your ass is grass by rebel27 December 18, 2008

your ass is grass 

you're gonna get pounded

If you do that one more time Prescott, your ass is grass

your ass is grass by Ilovebambam October 5, 2020

Your ass is grass 

I’m gonna pound you. 😡😡

If you do that one more time prescott, your ass is grass

Your ass is grass by Ilovebambam October 5, 2020

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!

your ass is grass and I'm the mower by anonymous January 29, 2005

your ass is grass and you can call me john deere 

redneck way of saying "I'm gonna kick your ass"

Bubba if you touch my momma again, your ass is grass and you can call me john deere!

your ass is grass and you can call me john deere by dboyfromdahood October 2, 2012

your ass is grass and i'm the lawn mower 

The expression of which your ass is grass comes from if you hear this you better get out of town because you're likely to get shot hung or end up with your head on a stick

Idiot1: oh dude I am so dead
Idiot2: yep that's quite a bit of a fender bender there
- idiot1 gets home-
Idiot1's roommate: heard you my moped just want you to know ass is grass and I'm the lawn mower
Idiot1:* shit himself*

And that my assholes is how the term:
Your ass is grass and I'm the lawn mower
Turned into: your ass is grass

your ass is grass and i'm the lawn mower by ಠ_ರೃ 1997 June 26, 2018