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1. Grumble
The lava like substance that is found in the Grumble Volcano level of Mario Kart Wii. Can also be used to mean anything that would be undesirable to fall into.
When the green shell knocked me off the race track, i fell right into the Grumble.
2. grumble
The act of simultaneously pressing the left and right arrow keys on the keyboard whilst playing Bubble Trouble (on Miniclip). Usually appears to be a swift back and forth motion or sliding dance.
kid1: dude quit doing the grumble and play the game!!!
kid2: but you totally stole all my bubbles!
3. The Gromble
An awesome rock band based in southern Orange County.

"Laguna Niguel quintet, The Gromble, sounds exactly like what you would imagine a band to sound like with a name based off a 1990s Nickelodeon cartoon. Like a food fight at summer camp or a make-out session on the playground, The Gromble evoke feelings of those wild, fleeting moments of rebellious freedom while adulthood loomed in the shadows."

-KROQ
Going to see The Gromble perform tonight!!
4. mumble-grumble
the need to take a massive intense shit
ive been holding this mumble-grumble all day.
5. grumble
Interjection. Can be used anywhere, assuming the user is a badass like me.
ROAR! Grumble grumble!!!
by Dangar the Mighty Oct 27, 2003 add a video
6. Grumble cakes
A term used by Strongbad. They are in competition with "The Cheat Cakes". The slogan for The Cheat Cakes is "Only liars and cheaters eat grumble cakes, and those people go to prison. Just ask The Cheat!"
"I could kill for some some delicious grumble cakes right about now"
7. grumble muncher
a kid in the lunch room that grumbles all the time when he eats
damn that kid over there is a total grumble muncher
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