blackout, adj. — Green’s Dictionary of Slang

blackout adj.

also blackout drunk

[n. use, ‘an amnesic gap, esp. for events occurring during a period of alcohol intoxication’ (OED) is SE]

(US campus) drunk.

2012		C. Eble UNC-CH Campus Sl. 2011 1: BLACKOUT — drunk: ‘Sara was so blackout last night that she forgot her own name.’.
2021		Betoota-isms 111: [Y]ou can’t even hang out with your mates without getting blackout drunk on mid-strength beer.
2022		I. Fitzgerald Dirtbag, Massachusetts 105: [S]tudents looking to get blackout drunk.
2023		J. Jackson Pineapple Street 204: [W]hen they drank Georgina slipped quickly from buzzed to blackout.