Jack shack

When a inmate put his sheets around the bottom bunk to make a shack to Jack off in

Go away I'm going to make a Jack shack

by Johnny Ex con April 15, 2018

Jack Shack

When your wife/girlfriend is menstruating (i.e. on the rag) and the only sexual release available to you is masturbation.

(This is a tribute to the late comedian Robert Schimmel, who coined this phrase before his death in a song of the same name.)

John: "Hey. You alright, man? you look tense."

Ray: "Yeah. The wife is on the rag, man.. Gonna be a long week in the Jack Shack."

John: "Ah. Gotcha."

by Averant September 19, 2010

Jack off shack

the stall in a dorm or shared bathroom that you or someone else always beats their meet in.

"Has anyone seen Dan?"
"He's in the bathroom and I saw him go into the jack off shack so it'll be a while"

by lillukey August 16, 2018

Jack-shack

An instant portable, mobile easy to carry and store personal private masturbating structure.

Hey Phil, can I borrow your jack-shack for an hour?

by Thomas Jonathon Crapper May 4, 2025