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A jack shack is a place like a seedy massage parlor or "modeling studio" or "gentlemen's spa" where you can get a hand job for a reasonable price, and little fear of getting arrested for soliciting.
Hey buddy, gotten your rocks off at the jack shack lately?
by Alex Selfridge October 21, 2005
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Usually specific to soldiers, or other people who are forced to live in close proximity for long periods of time without either sexual activity or privacy, a jack shack is a small shack made out of blankets, ponchos or poncho liners that is erected so that the builder can masturbate in relative peace. It is often explained away as a means to block light, or provide privacy to change, despite being erected almost exclusively around one's sleeping quarters.
syn: whackatorium
He had only been in Iraq for a week, but he had already built an intricate and comfortable jack shack.
by Barchack April 13, 2008
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An establishment that provides cost effective massage treatments of the sexual variety. Also known as a massage parlor.
Jonathan frequents jack shacks because; (a) he's drunk, (b) he's horny, (c) he loves the smell of Clorox, or (d) champagne rooms are too expensive.
by ItchyandScratchy October 17, 2005
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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
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A building which sells sex toys and porn videos and has 25 cent peep shows in the back room.
Hey mom, gimme a roll of quarters so I can go down the jack shack and rub one off.
by mws August 06, 2003
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A semi-private location used to relieve one's self while on Big Brother 7/AllStars.
Howie and Mike both used the jackshack because they needed to get their rocks off.
by JeremyTTU August 02, 2006
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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."
by Averant September 18, 2010
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