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
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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."
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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"
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