half jack

Jacking off and ending right before you’re about to cum and then proceeding to workout right after to maximize T-levels. Proven way to get your biceps bigger
Better Pre-workout than Gnar Pump

Me: Hey Joe, why couldn’t you sumo deadlift 450 today?
Joe: Bro, honestly, I didn’t half jack today, I’m just not feeling as good
Me:Pussy

by Half-Jacking December 12, 2018

half jack

"Half Jack" refers to a person who is gender confused, and possibly considering sex change surgery. A person who either feels that they are of the wrong gender, or that they are half male and half female.

Mary was really into Tom at the party last night, but she wasnt aware that he's "Half Jack" and had no interest in her.

by Scott the Heirophant February 09, 2008

Half-jack

You get so uninterested in masturbating, that you stop before you cum.

Peter: Dude! I was so baked last night, I was whacking off and got bored and stopped.

Paul: Just a half-jack then?

by Goldfish408 March 04, 2010

Half-jack

The process of exciting male genitalia until it is partially erect in order to help the refractory period after getting the first "easy" orgasm out of the way.

Joe half-jacked so that later when he has sex with Jennifer Whoreton he would be able to reduce the time between sexual excursions.

by LanguidLover July 19, 2011

half jacked-off

a synonym for half-assed, half baked, et al. Usually used to render scorn on a famous person/celebrity who, for all their glitter, charisma and talent really puts forth a miserable effort in said situation.

Ben Affleck's cinematic efforts of late have been generally of the half jacked-off variety.

by Virgin Suicides June 17, 2017