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know jack 

Australian slang - means to understand, to know.
he doesn't know jack about rugby - he knows nothing about rugby
know jack by An.kim September 25, 2014

You Don't Know Jack 

A: Hey, dude! 34 that on Photoshop.
B: 34?
A: Yeah, make that steamy.
B: Steamy?
A: Dude, you don't know jack about imaging, don't you?

you dont know jack shit 

you dont know jack shit a word meaning you know nothing or are too stupid to figure it out
dude whats an electric car

man you dont know jack shit you are too stupid to know what an electric car is unless you get ran over by one

you don't know jack 

An extremely popular video trivia game where the categories are outrageous, the questions are hilarious and the host makes fun of you when you're wrong! Everyone I know goes crazy for these games.
Have you played today's Daily DisOrDat game on the You Don't Know Jack Website?
It's called:
Spank Me! Spank Me Per the Geneva Convention!
Me DisOrDat you long time.
And it tests your knowledge of two very important topics!
you don't know jack by Marcy33 December 27, 2006

do you know jack? 

no, do you know jack?
do you know jack? by proprioception October 18, 2010

You Dont Know Jack 

This a game that is played online. It gives you 4 letters, for example PLEP. With those four letters you must make it into a witty remark, each word strating with those letters. PLEP could become "people Love Eating Pie" the quickest answer gets 1 vote. Once it is submitted other players vote on it and the one with the most votes wins ( you cant vote for urself)
Cam is good at playing "You Dont Know Jack" he always get a vote, he thinks quick.
You Dont Know Jack by pink_elephant January 12, 2007
More from Urban Dictionary

Slop Grenade

When someone uses AI to generate a large document, slide deck, or piece of code/software and tosses it over the fence for you to deal with.
Chad: Hey Brent I sent you the new backend API change to review, it’s only 100 files changed.

Brent: he just tossed me a slop grenade
Slop Grenade by Joe Squid September 28, 2026
Word of the Day on September 29, 2026
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
After we broke up, he was floxi to me.
floxi by Dr. Geek May 13, 2009
Word of the Day on September 28, 2026
NYC people who migrate north to Quahog, RI to see the leaves in the fall.
New York and everyone from there can fornicate themselves with an iron stick.
leafers by ss++ February 8, 2005
Word of the Day on September 27, 2026

Respectfully 

Precedes or follows either a gratuitously disrespectful or honest remark, originated in New York City. Used in similar fashion to "no offense" or "to be honest," interchangeably.
Ya mans is wild buns, respectfully. Respectfully he's washed.

After school, The Modells on Jamaica Ave was active. Respectfully.
Respectfully by john quan the first December 20, 2020
Word of the Day on September 26, 2026

You met me at a very Chinese time in my life

A moment in time where you feel distinctly Chinese over all other things.
Dante: "I wish I could be Nigerian, but I can't because I'm Chinese. You met me at a very Chinese time in my life."
Word of the Day on September 25, 2026
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