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grumpin is the slang term for actively making yourself grumpy(to the extreme)
grumpin comes about while talking to Asians about big trucks, and fast cars (besides Toyota MR-2's)
grumpin by Bryan Harving November 4, 2007
A person in the act of or a participant of farting in bath tub. pool or body of water and catching tainted bubbles in mouth.
A person sets in bath tub lets one loose and bends down to catch fart bubbles in mouth. - Grumpin -
Grumpin by KSWingNut January 16, 2011
(verb) The act of vigorously passing a particularly stubborn bowel movement. Usually involves grunting and the straining of one's sphincter. See also: Constipation
I hate when I'm in the bathroom at work and someone is grumpin' out a gnarly deuce. Gross...
Grumpin by SneakyMe September 2, 2011
A slang for someone who has a massive pp
“Wow he’s grumpin”
Grumpin by TheImpish March 7, 2021

It's Grumpin' Time 

When it is time to Grump.
Epic Grumpyre: It's Grumpin' Time!

Matt: Oh no
It's Grumpin' Time by msmfart July 28, 2022

It's Grumpin Time 

The Catchphrase of Epic Grumpyre from My Singing Monsters.
"The Shadow Elemental can hear even the most hushed lip-smacking of any Monster enjoying Treats, and particularly loves to mutter the catchphrase, "It's Grumpin time," as it enjoys a late night snack of its own."
More from Urban Dictionary
anyone who succeeds in disgracing/over indulging themselves in the throws of clubland
28 hours and 4 clubs later, gurning for england but still refusing to go home - a total wrongun!!
wrongun by bevvers March 21, 2007
Word of the Day on October 8, 2026

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026
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