1. (noun, English) The euphoric and/or pleasurable sensation induced by the Xbox video game "Halo." Usually experienced during massive multiplayer experiences, or when the player hears the cue word "killtacular."
2. (verb, English) To experience a halorgasm.
"When that 16-person Halo game started up, and I immediately got ravaged by four rockets at once, I had the best halorgasm of my life." or,
"Gunning down everyone on the blue team made me halorgasm hard."