When your brain can't decide whether you want to hug / snuggle / fuck - so you attempt all of them at the same time. Usually caused by a combination of loved-up affection and raw lust
Sara stayed over last night and we hugglefuck'd for hours - I'm so happy, and exhausted!
A hagglefuck is somebody so horrendous, that if anybody has sex with him/her, their status is almost irrevocably lowered among their peers.
Whereas some people will "go fishing" at parties in order to get laid, the hagglefuck casts a wide net in order to get somebody to fill that gap in their life. Anybody will do, but usually the hagglefuck will attempt to snare the drunkest of the lot.
The one way to reverse this lowering of status is to quest for the silver condom.
The person who has sex with the hagglefuck is thereafter referred to as the junkyard warden.
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.