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!"
by grassy ass lover 1234 December 28, 2016
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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.
by rebel27 December 9, 2008
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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!
by anonymous January 29, 2005
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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
by ಠ_ರೃ 1997 June 26, 2018
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