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Sac Jack 

To jerk only your sac when masturbating. Not the normal occassional tug on the sac, but pulling so hard that you nearly rip it off causing severe pain and swelling in the testicles. Usually done in conjunction with the bloody jack.
Your mom is hot, I think I'm going to sac jack to her and then beat the fuck out of her.

Cactus Jack

The real form of this phrase is similar to a masturbatory experience known as "The Stranger" (in which you sit on your hand until it is numb and masturbate so that it feels like someone else is doing it)

The only variance is that when doing a "Cactus Jack" you wait for partial numbness to restore until you feel the "Pins and needles" in your hand. You then masturbate and it feels like you're jacking off a real cactus.

Other Notes: It does not matter much if you reach climax during this as real cacti retain liquid and cannot orgasm.

Should you jack off a real cactus please seek immediate medical help.
John was giving himself a stranger in the closet when suddenly it turned into a god awful Cactus Jack situation when the feeling in his hand came back. Next time John will sit on both of his hands before an attempt.
Cactus Jack by Bongsc2 January 21, 2010

ball the jack 

From the 30's, means going realy fast, mainly with a car or any wehicle.
You realy can ball the jack in Germany
I was late, so I balled the jack on my way downtown
ball the jack by Peter B August 27, 2006

Union Jack 

Union Jack by Anonymous August 15, 2003

Kangaroo Jack 

An unbelievably bad movie, that involves a smart ass CG kangaroo, and an unlikely multi-ethnic duo of ass tards trying to get a jacket back from said Kangaroo. (Jack)
I hated Kangaroo Jack so much, I shat myself in the theater just to have an excuse to leave.

john jack 

"hey we still up for tonight?"
"nah sorry i cant anymore"
"you john jack'd me!"
john jack by hannahbanana123 January 8, 2009