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an irrational, idiotic manbaby. The name derives from the latin word Gruuknalia (meaning uncontrollable rage). A grunk is a person who is incapable of basic human speech and communicates only via grunts, shrugs and inchorent crying. Many teachers at a school will try to take care of a grunk and try to contain him. But from the Non-stop screaming and shaking to the constant barrage of fully used diapers, grunk(s) will usually be distributed and sent to the SCP foundation to be contained securely.
"Have you seen Greg recently? He's been out of control and acting erratically..."
"I don't know, i'm suspicious he might be a Grunk."
Grunk by Crustacean King November 20, 2018
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Musical genre 'Grunk'. Stands for Grunge Funk but not limited to just 2 genres. Limitless music.
Example 1:
"John Smith Quintet is the first 'Grunk' band"

Example 2:
"Lets play some Grunk"
grunk by Jacob McDonald April 17, 2008
Related Words
A contraction of the adjectives "gay" and "drunk". A condition resulting from an abnormally large intake of alcohol; where an otherwise heterosexual male exhibits overtly homosexual behavior.
"Andy was totally grunk last night. He kept grabbing my ass and rubbing against me on the dance floor."
grunk by Adam Galvan December 12, 2004
The amazingly new undiscovered musical orgasm to the ear, mind, body and soul known as grunge-funk
Example 1
"Dude what's this awesome music?"
"That my good chum is uncut dirty grunk!"

Example 2
"I think grunge is good and all but its so depressing"
"All you need my friend is a hot injection of groove... GRUNK IT UP!"
grunk by Jack Pack August 1, 2007
Acting gay when getting drunk. Example: "Did you see Greg the other night, he had a six pack of beer and he was acting like a Grunk!"
Grunk by Matthew Ivy September 28, 2013
A shortend term for the name used to describe a Grunka-Lunka, who feature prominantly in the Futurama episode "Fry and the Slurm Factory." Grunk is commonly used as an insult (to claim that a person or thing resembles a Grunka-Lunka, or acts like one in anyway.) But is mainly used to replace the phrase idiot, sadcase, fucktard etc, especially if you can't think of another term to call you're friends.
Example 1
Jake: "Hey, you reckon we should go to Matt's house?"
Nathan: "No, you fucking grunk, his house is a shithole."

Example 2
Jake: "Jakea-lakea, spanka-la-matts, lets go over to matts"
Nathan: "No, you fucking grunk, his house is a shithole."
grunk by grunk December 10, 2006
When grandpa gets in to the liquor cabinet at four in the morning. Probably has a half smoked blunt and is blurting out racist slurs he learned in the Vietnam war. When he finally sobers up he will just say what are you looking at to the closest person near him and take a shot of nightquil and pass out on your couch to start the cycle over again the next day
Child: mom grandpa is scaring me

Mother: don't be a little bitch grandpa is just geting his grunk on
Grunk by Grunk fund June 11, 2018