Slang in American English - J

J

JK – Just Kidding

I'm just kidding about that dude. Relax.

Jam:
Tough situation.
I don’t know how I’ll get out of this jam. 

Jam packed:
Crowded.
The mall is jam packed.

Jerk someone around:

Treat someone disrespectfully.
The mechanic was jerking me around about the repairs.

Jiffy (In a jiffy):
Quickly.
We’ll have it ready in a jiffy.

Jinx:
To bring bad luck.
He jinxed me by saying, “There’s no way you’ll fail your test!”

Jock:
Athlete (often with a negative feeling).
I hate that dumb jock.

Just plain:
Obviously. Clearly.
Her idea that I don’t love her is just plain wrong.

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