A massage parlor, usually located in a strip mall, where the phrase "you want to turn over?" means it's time for "happy ending".
TJ just got back from the whack shack, those Asian girls gave him the 3 finger special.
by Mediumdave22 February 2, 2011
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A bed with a canopy arranged in such a manner as to allow complete privacy for the act of masturbation.
Billy spends all day hidden in his whack shack.
by njj October 1, 2006
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A make-shift privacy tent built on beds found in collage dorms or the squad bay of a millitary instillation, and used for masturbation.
I think Pvt. Jones is in his whack-shack sarge its moving side-to-side.
by kimjongjr October 20, 2009
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1) A make shift lean-to made in ones bed room out of blankets, chairs, pillows, and the bed itself, where one masturbates in privacy.

2) A covered shower in a locker room where one wanks.

whack procedure:
Get in
Get off
Get out
1) Everyone knows what my roommate is doing when he is skyping his girlfriend and brings his laptop into his whack shack.

2) The quarter back swears hes straight, but hes not fooling anyone when he suggests drilling a glory hole into our locker room whack shack.
by Mr. Billy Shears February 18, 2009
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To whack someone in the balls while saying SHACK WHACK!
SHACK WHACK (when you hear someone say that your not gonna have kids or be able to walk. also if a Cambodian kid says that YOU BETTER RUN!!!!!)
by RickyJohnJones May 13, 2021
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