Jack-rack 

1) Hanging upside-down whilst cracking one off; [2) Someone engaged in 1).

From the sink-holes of Surrey in England.

1) My back was killin', but I fancied a quick spaff, so I did the Jack-rack.

2) Dude, you're such a Jack-rack.

Jack-rack by Tuomas February 21, 2006

Jack rack 

Shower

My girlfriend caught me in mid stroke last night when I was in the jack rack, i could've died from embarrassment!

Jack rack by ALL BIZ February 7, 2018

rack-jack 

to steal one's date, escort, etc.
origin: tv show "How I Met Your Mother"

I can't believe he rack-jacked my date!

rack-jack by smoocharoo October 3, 2006

rack jack 

to steal a girl from a someone that they are trying to hook up with.

Bob:"Dude, I met this chick at the bar last night, and later I went for a bathroom break. When I came out I saw John making out with her."

Joe:"Aw man, he totally rack jacked you"

rack jack by mista biggins September 23, 2008

Rack Jack 

The act of masturbating while in your bed (rack) when you're incarcerated

Bunkie: dude. Why is our rack shaking!?

Me: I couldn't stop thinking about my girl so I figured rack jack for a bit

Rack Jack by GOD for short February 3, 2015

Rack Jack Bandit 

The Rack Jack Bandit is an anonymous man that appears across US NAVY ships only when at sea. He approaches in the dead of night to give his victims ruthless handjobs in their racks (bunk beds) while they're asleep.

I told my cheif that I was attacked by Rack Jack Bandit so I could get the day off.

Rack Jack Bandit by SophiaMane December 29, 2020

rack jack 

to steal a girl from a someone that they are trying to hook up with.

"Dude, I met this chick at the bar last night, and later I went for a bathroom break. When I came out I saw John making out with her."

"Aw man, he totally rack jacked you"

rack jack by mista biggins September 22, 2008