by Pinkdude July 31, 2019

When masturbating, holding back for too long and then letting go, only to find that you've missed the orgasm, but still ejaculated. Disappointing, all the work but none of the reward.
by ()*%^$#@&! April 4, 2006

A sibling who you do not have the same parents as. HALF siblings either have the same mother only, or the same father only.
by Fame Hungry June 17, 2009

by jd May 2, 2004

Someone who actively decides to do less than their best because either they don't care or they feel the task doesn't deserve the time it would take to do a good job.
"Joe, are you going to put much time into your progress report?"
"Naw, I'm gonna half-ass it, cause nobody will EVER read it anyways".
"Joe, you're such a half-asser".
"Naw, I'm gonna half-ass it, cause nobody will EVER read it anyways".
"Joe, you're such a half-asser".
by Tanner August 31, 2004

upon climax (either self-induced through masturbation, or with a partner) one covers half of the penis hole with the thumb to increase internal pressure in an effort to maximize the velocity and thus distance of the ejaculate.
by hairy potter July 10, 2004

(noun). The pursuit or practice of working in a manner that is predictably subpar in quality, effectiveness, and timeliness.
Garythomas duncan continues his half-assedness in the computer and IT field; therefore, IT effectiveness for the company has dropped significantly over the past four quarters.
by K Numen December 13, 2008
