jack of all trades 

A term used to describe someone who knows a lot about many things, but, with the second tag "master of none" added it transforms into a derogatory phrase meant to emphasize how mastery of one skill is important for deeper knowledge.

However, one, oft forgotten tag is the third one: "is oftentimes better than a master of one". Instantly, the term reverses meaning, symbolizing how a person who knows a lot about many things that integrates their skills allows them to surpass even a master of one.

Interesting phrase, nonetheless.

"Man, Tom knows a lot! He's a jack of all trades, aint he?"

"Yeah, but he probably doesn't know a lot about specifics. You know how it goes: Jack of all trades, master of none."

"Jack of all trades, master of one, is oftentimes better than master of one, man. Tom's pretty smart."

jack of all trades by Oldrego March 9, 2017

jack knife barber

A person who performs illegal abortions. This term is used in the Jethro Tull song "Cross-Eyed Mary," which is about a very young prostitute.
"She dines in Hampstead village on expense accounted gruel,
And the jack knife barber drops her off at school."

Mary had an unexpected surprise, so she paid a visit to the jack knife barber.

jack knife barber by mito0 October 12, 2008

One eyed jack 

A person who shows the good side of themselves, while hiding the other side of themselves as being incredibly repulsive, insincere, malicious, and untrustworthy.

You are a one eyed jack around these parts, Dan. I have seen the other side of your face.

One eyed jack by Lexus Nexus July 3, 2014

Micheal Jackson 

The common misspelling of Michael Jackson

" I LUV MICHEAL JACKSON U R DUM"
"... It's Michael you twat."

Micheal Jackson by iHugTrees March 11, 2010

jacksepticeye 

A smol Irish green bean who's literally one of the nicest people on earth with over fourteen million subscribers on YouTube. He's best friends with Markiplier, Muyskerm, LordMinion777, and god of YouTube Pewdiepie.

No, mom, it's not a waste of my life for my only reason to live to be to meet Jacksepticeye!

jacksepticeye by Calersion January 8, 2017

jackaholic 

To masturbate very frequently, at least 6 times or more daily. usually a twelve or thirteen year old who is very horny.

"Son!" Wes mother? "You are such a jackaholic!" "I know."

jackaholic by raven January 28, 2003

Jack Dice 

Jack Dice is when a person rolls a dice, declares the number (or simply a result, like a success), and plucks the dice off the table so quickly the result cannot be verified.

It is as if the dice was snatched off the ground as quickly as picking up a jack in a game CALLED "Jacks".

Person 1 rolls dice, a 2 and a 3

"Wow, I rolled a 12!" and quickly scoops them up before anyone else can read them.

Person 2: "JACK DICE!"

Jack Dice by Pubwookie August 19, 2009