Green’s Dictionary of Slang

jet n.²

(drugs) ketamine.

1984		Abel Dict. Drug Abuse Terms.
2001		ONDCP Street Terms 13: Jet — Ketamine.

SE in slang uses

In phrases

full-jet (adv.)

using all engines, extremely fast.

1951

Kerouac On the Road (The Orig. Scroll) (2007) 215: Neal [...] shot the car full-jet down the road.