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An adjective denoting the already waxy, slightly washed out sound of a brand new vinyl record you just barely opened to play. Most often seen in vinyls bought from supermarkets and similar large chain stores for high prices after the resurgence of vinyl records into the mainstream. Note that this word doesn't apply to old, well loved vinyls. Your grandma's Stones album from college that sounds like it's being played through a wall in present day is well worn. Grummy vinyls already had poor sound quality at manufacture. Generally not a problem if you're not a total audio freak, but those concerned with sound quality find grumminess quite annoying.
I bought a Green Day vinyl from Target for thirty dollars and it sounds super grummy, even after I cleaned it! I'm pretty disappointed, it's hard to find good sounding vinyls in the wild these days.
Grummy by Crox T. Cryptid June 7, 2022
Related Words
A mix of grubby and grimey. Used to describe generally gross things.
“Did you see that guy’s mullet?” “Yeah it was really grummy”
Grummy by gummybearfolder September 21, 2023

Grummy Bear 

A bear living in the northern parts of America. They are especially common in the Canadian Wilderness. They are made of 100% mechanical pencil grip gel.
Dang, another grummy bear ate my pencil. I just hate it when that happens.
Grummy Bear by KiwiSundae January 16, 2019

grummy cock 

The art of having a particularly crusty penis.
Person 1: Damn that guy from Caboolture has an absolutely wacker of a grummy cock. Person 2: Fucken ken oath mate you're better off in Townsville, I can smell that shit from the sunny coast.
grummy cock by cabooltureboi May 22, 2019

Grammy Silver Voice 

Grammy Silver Voice is Jin of BTS. His breathing is so stable that he can easily switch from his head voice to his chest voice, still equipped with a natural vibration and pleasing falsetto which is an extremely strong advantage.

"Grammy panel, BTS THE REVIEW"
"I would like to express Jin as Silver Voice, Grammy Silver Voice"
Grammy Silver Voice by LamborJINi September 9, 2019

Northrop Grumman 

An American global aerospace and defense technology company formed by the 1994 purchase of Grumman by Northrop.
The company was the fourth-largest defense contractor in the world as of 2010, and the largest builder of naval vessels. Northrop Grumman employs over 75,000 people worldwide. Its 2010 annual revenue is reported at $28 billion. Northrop Grumman ranks No. 72 on the 2011 Fortune 500 list of America's largest corporations and ranks in the top ten military-friendly employers. It has its headquarters in West Falls Church, Virginia.