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1. v. The opposite of masterbating; wordjack off/word
2. n. An uptight cock-sucker; wordfuck-face/word
I enjoy a good game of jacking in.

That billy is such a jack in
jack in by jim jimson November 27, 2002

Jack Dawson 

A sexy guy. His Penis is 1 foot long and he is always having sex. He is smart and good at video games. He has never failed a class and he is always playing sports. He is 6 feet tall and irresistible.
Jack Dawson is very sexy.
Jack Dawson by ABBY Scott!!! June 13, 2018

jack n' lisa 

verb:
to do the dirty while driving a car bare fast.
"Holy shit! They just totally did a jack n' lisa...hard."

"Last time i jack n' lisa'd i crashed into a school."

Jack Jack and Tay Tay

1. Two awesome, beautiful ass hanging out bitches who are crazy and have guys drooling over them all the time.

2. They get with all the guys at school and love to party. Both of them flirt with any guy they see even if he is ugly because she is obsessed with boys.
3. They both absolutly love muffins meaning the food and their friend muffins who they think is the most awesome hilarious person ever!
4. They are mainly girls who loves to let their ass hang out and always have a guy by their side because they flirt all the time!
Two girls go to a party they start dancing and have guys drooling over them. They flirrt with all of the buys even if they are ugly and they eat muffins while grinding some guys! They are known as Jack Jack and Tay Tay!

Jack-in-the-box 

When one takes Adderall when one is still half asleep, whilst setting one's alarm to go off ten minutes into the future. When the alarm goes off, one will find oneself jumping up, suddenly wide awake. Popping up out of one's bed like that fey, much-celebrated children's toy of yesteryear.
Jack: Give me some of your 10 mg generics, I am going to need to pull a Jack-in-the-box this morning.

jack with 

(v) to masturbate with another person
I used to jack with Steve to internet porn.
jack with by chung chung August 1, 2004