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The act of having an orgasm that doesn't give you pleasure. A small amount of cum is released, but the intial feeling of an orgasm is not there. Is normally the result of some bad internal timing.
Joe: How'd it go with Susie last night?
Bob: Terrible, I only had a halfgasm.
Halfgasm by King Singh December 17, 2008
Related Words

half-gasm 

when you're jacking off and you're not really feeling it yet but you cum anyways and you end up feeling horny again soon thereafter. usually happens when you're in a rush or about to get caught.
i was wacking it to some hot pics of jenna juggs 'til i heard someone knocking and i half-gasmed. total buzzkill.
half-gasm by silly hats only October 20, 2008

half-gasm 

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.
I jerked for 30 minutes only to be rewarded with a half-gasm.
half-gasm by ()*%^$#@&! April 4, 2006
When your being half-heartedly sarcastic or half sarcastic.... therefore; halfcastic.
Use:

Q) we havent been out in so long...

A) I know right!?... its been sssoo long
Q) was that sarcasm?

A) No dear... that was halfcasm.
Halfcasm by Zebedeezazoo November 23, 2017
The intense feeling of joy you get when you first bring home the Xbox game halo and pop it in for the first time.
I had the best halogasm ever when Halo3 was released for the Xbox360.
halogasm by Greg Bell October 9, 2007
The period of time in which an person continues to feel an orgasm after having a sexual experience.
Stephanie was useless in the staff meeting because she was still I her halogasm from last night.
Halogasm by Dirk217 October 16, 2018