Green’s Dictionary of Slang

(US) aggravated.

2015		‘Harry Brandt’ Whites 2: Eight a.m. could find him at a local precinct writing up bullets on an agg assault.
2015		S. King Finders Keepers (2016) 78: Morris prayed to a God he did not believe in [...] ‘Assault, God, okay? Simple, not ag. Just not murder’.