jackstab 

(jack-stab)
-verb

Literally stabbing an unsuspecting victim in the back.

"I wouldn't walk through the ghetto at night if I were you. You might get jackstabbed."

jackstab by Dyslexicon March 29, 2010

jackstack

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.

jackstack by Beeyo November 1, 2007

jackstall 

Pronounced jack-stal
Verb: To quit or pull out of something because you are rubbish at it.
Noun: Someone who frequently quits things or has recently quit something because they were doing badly.

'i got an E in Latin in the mock exam. I think I might jackstall it.'

'I'm rubbish at Latin, I think I might quit.'
'You're such a jackstall.'

jackstall by please accept. i cba try again December 27, 2016

Jackstain 

A stupid person described by a spot or spots of ejaculation.

"Paulie was busted after trying to buy weed from an undercover cop...he is a real jackstain."

Jackstain by Shawna123 September 2, 2005

jackstack

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.

jackstack by Dan Brooks December 23, 2007

Jackstand 

When one inserts a bottle of Jack Daniels into ones own rectum and proceeds to complete a handstand.

"I was so intoxicated following my second jackstand."

Jackstand by Bra2011120 January 11, 2012

Bean's Jackstalk 

Bean's Jackstalk is what happened when Jack accidentally bent over in front of the beanstalk and it went way up his ass.

Bean's Jackstalk is something all men fear, like the Ruins, except worse.

Bean's Jackstalk by Jacques Asse June 4, 2009