The act of guilt-tripping a friend; making sure that everyone in the room knows that you were left out; hosting a pity-party on yourself.
Friend 1: (To Everyone) Well thanks for the invite. It's not like I wanted to hang out with everyone. I just stayed home alone with no one to talk to.
Friend 2: Quit nelching dude, no one cares.
by PhiTauPrezzzz February 11, 2012
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The word used to describe a person who is infatuated with little girls in cat costumes. Most people who do Nelch often do it to their close relative, such as their little sister.

A Nelch is someone you need to run away from if you're a little girl.
Don't touch me like that! You're such a Nelch!

Stop Nelching around!

Dude! Look at that guy Nelching his little sister
by Cohort11 October 20, 2016
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A memetic hazard created by artificial intelligence as the speech bubble text of a character looking back at the viewer. Every single server the image is posted to, at least one person replies “nelch”, as is the nature of the memetic hazard.
The memetic-hazard image is posted
“Nelch,” someone replies.

An AI-generated image is posted
“Nelch,” someone replies in recollection of the memetic hazard or to acknowledge its cuteness.
by Pontology December 20, 2022
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