Jack On

To reverse ejaculate, using your penis to suck in the semen like a vacuum cleaner.

I heard my parents coming to my room so I quickly had to Jack On

by Will_I_Am23 November 16, 2020

Jack On

to get a jack on,
to walk so closly behind someone as to invaid their personal space.
treading on another mans heel

*one guy treads on anothers heel*

"oi!, whats this?? getting a JACK ON are we?"

by stonerchris January 24, 2008

jack and jack

They are two vine famous teenagers from Nebraska. They also have many good songs like "doing it right" and "flights". Jack Johnson and Jack gilinsky are also very hot.

Girl #1- I love jack and jacks song doing it right
Girl #2- Me too

by I love to turn up August 11, 2014

Jack to Jack

The Jack to Jack (Back to Back Jack) Is the attempt to masturbate immediately following a previous orgasm.

I attempted a Jack to Jack but I was to sensitive to continue.

by CharitableNinja February 8, 2009

jack-jack

Person who is kind & wholesome until pushed over the line. Reference to baby JackJack from "The Incredibles" Movie.

Don't keep pushing him. He's going to go Jack-Jack.

Be careful with him. He's got a Jack-Jack personality

by moviedude March 9, 2008

jack jacked

When a guy is jacking off and is interrupted by a second individual who "lends a hand" and finishes the job.Ideally,the interloper could be the wife,girlfriend,a hot maid,or cute neighbor girl. Strangely,the good samaritan could be a sister,grandma,brother or roommate.

I was choking the chicken when my sister's hot friend barged in the bathroom and jack jacked me.

by wolfbait51 May 24, 2011

Jack Jack

When one leaves his seat and calls jack jack which ultimately reserves that seat for him when he returns. Jack Jack was created long before Tap Tap and Jack Jack actually over rides all claims to tap tap. Originated in the city of Gig Harbor which was founded way before Tacoma.

When you get up, "Jack Jack".

by Chris Macky January 4, 2008