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2.
A collection of pornographic magazines, typically located in the bathroom or bedroom that is used to visually aid the jacking off or masturbation process. This collection of magazines usually includes periodicals such as; Jugs, Beaver, Ass Jacks, Hustler, etc.
Wayne: Dude, you see the Jack Stack in Bruce's bathroom? Wow, impressive!

Frank: Yeah man, that was killer! I had to open them up and rub one off when I was at his house last week!
by Techsan93 December 06, 2008
 
1.
Smoking hot administrative assistant who makes up the thin line between loving your job and quiting.
I wasn't going to come to work today, but with jackstack around, it aint so bad.
by Beeyo October 16, 2007
 
3.
A large stack of porngraphic magazines that one would use to masturbate to or jack-off to.
My girlfriend found my jackstack and wants me to add some lesbian magazines to it.
by Dan Brooks November 21, 2007