jack n:
1. Money.
2. A small or worthless amount: You don't know jack about that.

jack off v : To masturbate.

jackoff, jerkoff, jagoff, jaggoff n:
1. A person who masturbates.
2. A detestable person.

jag n :
1. A bout of drinking or drug use.
2. A period of overindulgence in an activity; a spree: a shopping jag; a crying jag.

jazz n:
1. Animation; enthusiasm.
2.
b. Nonsense.
c. Miscellaneous, unspecified things: brought the food and all the jazz to go with it.
v.
jazzed, jazzing, jazzes
v. tr.
2.
a. To exaggerate or lie to: Don't jazz me.
b. To give great pleasure to; excite: The surprise party jazzed the guest of honor.
c. To cause to accelerate.
v. intr.
To exaggerate or lie.
Phrasal Verb:
jazz up
To make more interesting; enliven: jazzed up the living area with beaded curtains.

jizz also jizm n : Semen.
v.
jizzed, jizzing, jizzes
v. tr.
To eject semen in orgasm.

jerk n:
1. A foolish, rude, or contemptible person.
2. a dull stupid fatuous person

jerk off v : get sexual gratification through self-stimulation.

jigaboo n: Used as a disparaging term for a Black person.

jive n: Deceptive, nonsensical, or glib talk.

Johnson, John Thomas n: A penis.

joint n:
1.
a. A cheap or disreputable gathering place.
b. A building or dwelling.
c. A prison. Often used with the.
2. A marijuana cigarette.
3. A penis.

joystick n:
1. The control stick of an aircraft.
2. A manual control or cursor device, as one attached to a computer or video game.

jugs n: A woman's breasts.

junk n: Heroin.

juice n:
1. Vigorous life; vitality.
2. Political power or influence; clout.
3.
a. Electric current.
b. Fuel for an engine.
4. Funds; money.
5. Alcoholic drink; liquor.
6. Racy or scandalous gossip