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29.
to masturbate; a jerk; an asshole; Dale Ross; one who manipulates; brainwasher; penis
That jack-off just served you with court papers.
by pissedasfuk April 19, 2009
 
30.
When A Guy Holds His Dick And Rubs His Hand Up And Down Getting Faster Until It Feels Good And He Sperms.
Sence Vishal is so fat and ugly, and he doesnt get any girls. He jack-off in the corner
by VishalIsGay June 04, 2007
 
31.
Can be used as a noun to refer to a guy who wastes time, is a complete loser, and cannot get anything done. This guy may well be popular with friends, the ladies, and whomever he meets, but has never accomplished anything and never will. Anything he has tried to achieve has ended up in disaster.
That Kramer on Seinfeld sure is funny even if he is a complete jack off.

Steve, did you complete the final report so you can graduate from high school next week?

No. I'm such a complete jack off that I never get anything done.

Smoking pot will really just turn you into a lazy jack off.
by achyhead November 22, 2005
 
32.
A person who prevents everyone around them from discussing the finale of "Lost" because they haven't watched it yet. The prefix "Jack" comes from the first name of the candidate Jack Shephard. The suffix "off" refers to the person being a jerk-off.
Co-worker 1: Holy cow! Did you see "Lost" last night!

Co-worker 2: Shhhhh! This Jack-off dvr'd it last night and watched the ball game instead. We'll have to talk about it tomorrow.

Co-worker 1: What a jerk-off!

Co-worker 2: You mean Jack-off.

Co-worker 1: Yeah, whatever.
by mondo270 May 23, 2010
 
33.
moving the hand up and down the penis to create an orgasm
your mom loves to jack me off
by crapman August 22, 2003
 
34.
Someone who does not focus at the task at hand and instead messes around. Also can refer to someone who enjoys masturbation.
Today in study hall Johnny was a complete jack-off.
by TheRockstar June 15, 2007
 
35.
for a male to rub his hand up and down on his dick
i just rubbed my hand up and down on my dick
by sexybitch101 November 22, 2003