Jack

“You don’t know jack.” (you don’t know anything. you know nothing.)

“You don’t know jack about China.” (you don’t know anything about China.)

“Are you jacking with me?” (are you trying to fool me/make fun of me/mock me?)

“Don’t jack me around.” (don’t try to fool me/make fun of me/mock me.)

“Listen, Jack, you better get the hell out of here!” (in this case, “Jack” is used as a generic term for a man, like “pal” or “buddy.”)

“I used to love that restaurant, but then they jacked up their prices.” (they raised their prices very high.)

“I’m jacked up on caffeine and donuts right now.” (I’m intoxicated/high on caffeine and donuts right now…as if I’m on drugs.)

The word “jack” has many meanings. Of course, it is a common first name. But as you can see above it is also used as slang in a variety of ways. All of these are common.

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