Green’s Dictionary of Slang

intoxicated on dexedrine.

1972		T. Southern Sat. Rev. (US) 12 Aug. 25: Your basic Tequila Sunrise is not merely one of those chic, absurdly yin, innocuously thirst-quenching drinks (so prized by dehydrated athletes, entertainers, and heavily dexed writers working against viciously unfair deadlines), it is also Bombsville-oh-roonie.
1973		New Musical Express 27 Oct. at backpages.com 🌐 Finally, he ends up dexed-up and pissed out of his brain on a rock off Brighton Beach where he achieves some kind of satori and reconciliation with himself.
1984		N. Stephenson Big U 116: To us he looked like a strange dexed-out bird, not running across the front of the hall so much as vibrating across at low frequency.