Green’s Dictionary of Slang

(US teen/campus) utterly, completely.

1961		R.A. Norton Through Beatnik Eyeballs 77: I did think you going to double me total.
1989		P. Munro Sl. U. 195: I was total hungry.
2007		Skins ser.1 ep.2 [TV script] ‘Do you know what you’re doing?’ ‘Oh, totally I’m so fine’ [...] ‘You gonna eat this time, Cassie?’ ‘Totally’.
2011		Chicago Trib. 10 Nov. TAB-9/2: The dude was total loco.
2012		J. Fagan Panopticon (2013) 169: ‘I used tae play in bands.’ ‘Aye? I bet they were shite?’ ‘Total shite,’ he grins.