Green’s Dictionary of Slang

juice v.

1. pertaining to alcohol/drinks [juice n.1 (3a)].

(a) [late 19C+] (US, also juice back, juice down, juice (it) up) to drink alcohol, to get drunk; thus juicing n. and adj.

(b) [1910s–70s] (US) to milk a cow, also used facetiously.

(c) [1950s] to render drunk.

2. pertaining to power/energy [juice n.1 (4a)].

(a) [1920s+] (US) to electrocute, to kill or torture with electricity.

(b) [1940s+] (orig. US, also juice up) to increase the power of a machine, usu. an automobile.

(c) [1960s+] (US black, also juice up) to intensify, to augment, to liven up, to excite.

(d) [1970s–80s] (US) to attack with a weapon, to fire a gun.

(e) [2000s] to provide with electrical power.

3. in financial contexts [juice n.1 (1b)].

(a) [1950s] to bribe, esp. in context of organized crime paying off the authorities.

(b) [1950s+] to add interest to a loan, debt.

(c) [1980s+] to extort money, through threats or trickery.

4. pertaining to sexual activity [juice n.1 (2a)].

(a) [1960s+] (also juice up) of a woman, to become damp with sexual arousal; to reach orgasm.

(b) [1970s+] (also juice up) to stimulate one’s female partner to sexual arousal.

(c) [1970s+] (orig. US black/campus) to have sexual intercourse.

(d) [1970s+] (US gay) of a man, to sweat, esp. during sex.

(e) [1980s+] (US) to dampen with vaginal secretions.

(f) [1980s+] (US) in fig. use, to get excited.

(g) to speak persuasively; to seduce; esp. for personal gain.

In phrases

juice back/down (v.)

see sense 1a above.

juice (it) up (v.)

see sense 1a above.

juice up (v.)

1. see sense 2b above.

2. see sense 2c above.

3. see sense 4e above.

4. see sense 4f above.