by @kdhaynes April 21, 2009

A task so prolonged or difficult, it seems as though you're taking on more than you bargained for. Once completed, you feel so irritated (or relieved, depending on the situation) that you can't help but talk about it to someone.
Sophie: I didn't get picked up yesterday afternoon and had to walk home. It took me two bloody hours!
John Smith: That must've been a mission and a half.
John Smith: That must've been a mission and a half.
by MysteryGirl05 November 19, 2013

A variation of sexual intercourse enabling the male to give the female double the girth but only half the length. This is achieved by going in with a flaccid penis folded in half.
by SlyD0g March 4, 2017

Someone who wishes to be a legend however the person in question lacks the mental capability to be considered a legend.
by Legend Status October 17, 2017

When one has half of their head shaved and has the uncontrollable urge to wiggle their fingers fast.
by Astreet13 February 3, 2017

dimorian johnson
by trysaratops October 11, 2022

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
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
Joe: Bro, honestly, I didn’t half jack today, I’m just not feeling as good
Me:Pussy
by Half-Jacking December 12, 2018
