Green’s Dictionary of Slang

(US campus) to cause someone’s downfall, to destroy someone.

1969		H. Rap Brown Die, Nigger Die! 19: America’s a bitch. Being Black in this country is like somebody asking you to play white Russian roulette and giving you a gun with bullets in all the chambers. Any way you go, jim, that’s your ass.
1973		P. Maas Serpico 72: ‘You hit some bystander by mistake, then it’s your ass all the way’.
1989		P. Munro Sl. U. 33: This paper will be my ass if I don’t turn it in.
2015		P. Beatty Sellout (2016) 12: A secret diary [...] if I tell anyone about it’ll be my ass.