Green’s Dictionary of Slang

1. of a horse, spavined.

c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions .
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn).
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1859		Matsell Vocabulum.

2. (US campus) physically broken down.

1968–70		Current Sl. III–IV (Cumulation Issue) 74: Jacked up, adj. [...] beaten in a fight.
1997–2000		Da Bomb 🌐 16: Jacked: Beaten; dilapidated.
2002		Teen Lingo: The Source for Youth Ministry 🌐 jacked v./adj. 1. Thoroughly annihilated. Messed up.

3. (US drugs) to be under the influence of cocaine.

1985

T.R. Houser Central Sl. 31: jacked Having just hit the cocaine pipe, hence being under the influence of cocaine.

4. stabbed, attacked [jack v.² (6)].

1987		King Tee & Mixmaster Spade ‘Ya Better Bring a Gun’ 🎵 Can’t roll too hard, gotta watch my back / Cause if I don’t, I just might get jacked.
1997–2001		Online Sl. Dict. 🌐 jacked up adj 1. stabbed or attacked. (‘He got into a fight and got all jacked up.’).
2002		D.H. Sterry Chicken (2003) 187: Jade was probably junked up [...] got herself whacked or jacked or smacked.