Flacid Jack 

When the porn or any other source of sexual pleasure isn't hot enough to give you a boner and your penis is flacid like a flap jack, but you still rub one off anyways.

"I was watching tub girl last night, but she didn't do it for me so I pulled a flacid jack just for the heck of it."

Flacid Jack by DjDM May 20, 2009

Tack-Jack 

An act that refers to a male, where he has a fistful of thumbtacks while he masturbates. Used when referring to something he wouldn't do...

Oh, geez man! She is so fucking ugly! I'd rather go Tack-Jack than sleep with her.

Tack-Jack by Shikigama July 6, 2010

Ramblin' Jack Elliott

Ramblin' Jack Elliott (b. 1931) is the world's greatest folksinger. He is the bridge between Woody Guthrie and Bob Dylan and is actually the person who taught both Dylan, as well as Arlo Guthrie, Woody's material since Guthrie died early. An accomplished guitarist, he is known for his solid flatpicking skills.

Clueless Guy: Man, that Eddie Van Halen sure can wail!

Me: Uh, yeah, well, he's no Ramblin' Jack Elliott.

Ramblin' Jack Elliott by Ozarkian July 11, 2010

Heart Jack 

The ability to induce pleasurable orgasmic sensations of the heart.

Heart masturbation.

Probably heart healthy and regulates good behaviour in humans.

An ability of romantics as well as spirituals.

Singing "Fall on your knees! O hear the angels' voices!" is a heart jack for the spiritually inclined.

Heart Jack by filthymouth November 21, 2010

Reverse Jack Bridges 

1) The administering of oral sex
2) The art of hand made oral
3) Usually occurs when a Thai woman is present

David: "Hey, can I have a full on Reverse Jack Bridges, I feel in the need for one right now."
Christina: "Yes, of course you can, I just need to finish cleaning the kitchen."
David: "That a gir.l" *winks*

Reverse Jack Bridges by E-vad the second June 17, 2011

Spontaneous Jack Towel 

The towel that is kept handy by your bed side that is laid on top of the bed to prevent semen, lube, female ejaculate, Santorum or period blood from getting on the sheets.

Man, good thing we had that Spontaneous Jack Towel handy. That was a messy round of love making. The mood was not killed becaues it was handy by our bed side and now I can go to sleep knowing that I am not going to roll over into mixture of my semen, your ejaculate, and lube.

Spontaneous Jack Towel by Richard Driller October 14, 2011

Sock Jack

When a lonely man masturbates ( to the point of orgasm ) into a sock

Dude , I've gone through 4 pairs of socks , just by sock jacking

Sock Jack by MeowChammerpants October 26, 2013