Back Jacks 

When youre so fat you have flap jacks on your back.

The man in the McDonald’s drive thru had a gnarly set of back jacks!

Back Jacks by Pushyslayer April 16, 2022

back-to-back jacks 

1. In baseball, when two consecutive batters each hit a home run.
2. The act is sitting back-to-back with someone, while giving each other reach-around manual stimulation.

1. "Dude, I went to the Orioles game last night and Roberts and Markakis hit back-to-back jacks!"
"What was the final score?"
"They lost 10-2."

2. Tom and Kevin had some drunken back-to-back jacks last night, claiming it's not gay if they can't see what they're doing

back-to-back jacks by Castrati July 25, 2011

throw back jack

To pleasure onses self to old pictures of celebrities/porn stars who are currently past there prime.

"She may be ugly now, but I keep some of her old pictures from the 90s for a throw back jack"

throw back jack by scram.bler January 20, 2015

Jack Back 

Jack Back

1. To steal something back from someone who stole from you (i.e. jacked you).

2. To jump, attack, or otherwise harm in retaliation for the same thing having been done to you.

Popularized by the rap song of the same name.

Guy 1: Hey, there goes that dude who stole my Cd's

Guy 2: Did he lock his car door?

Guy 1: No, let's hit him with a jack back!

Jack Back by MastaRoe March 17, 2010

Jack back flan

when you place flans on a person's back and wank onto them until you cum and then they have to eat them

Matthew pulled a Jack back flan on me last night

Jack back flan by cumluvrrrr February 7, 2022

Jack Back 

He's basically David Guetta in a nickname

Dude: Do you listen to Jack Back
Another Dude: Who the fekfkekkf is that?

Dude: Bro it's David Guetta!

Another Dude: OOOOOOOOOOHHHHHHH!!!

Jack Back by MidTRahX_303 May 15, 2023

Double Back Jimmy Jack

This is one of the most difficult sexual positions and it's approved by Dr. Falchi as "corona safe" you are back to back doing it - you have to be very flexible.

We did the double back jimmy jack last night and my legs are killing me, I need to do more yoga.

Double Back Jimmy Jack by Vern the Man March 19, 2021