Green’s Dictionary of Slang

1. problems, trouble.

1983		A. Payne ‘Get Daley!’ Minder [TV script] 8: Harrison give me some agg, so I flashed the shooter at him.
1996		J. Cameron It Was An Accident 1: You shoved a geezer in nick meant plenty agg, you got one over the bonce in the recess.
1998		K. Sampson Awaydays 44: One young busy tells me it’s the best ag he’s seen in three years policing Liverpool, Everton and Tranmere.
2007		N. ‘Razor’ Smith Raiders 230: Bulldog’s crew never had an agg on their jobs [...] – even a blind man could see that these boys meant business.

2. (Aus.) anger, nervous energy.

1986		R.G. Barrett Real Thing 20: They were just finishing their sixth and final lap [...] (the boys were full of ‘ag’ at the time) .
1986		R.G. Barrett Real Thing 21: They were trying to release as much of the ‘ag’ as they could with a good hard paddle .