grumpuss 

a legendary mythical beast renowned for it's grumpy disposition

dude you're being such a grumpuss today

grumpuss by freggles March 18, 2011

Grumpus 

A terminally grumpy person, often genetic. Can be modified for various states of grumpitity.

Cheer up, don't be such a Grumpus!

That Grumpus has been growling at me for hours.

A Slumpus (A sleepy Grumpus)

A Lumpity Grumpus (A lumpier than average Grumpus)

Grumpus by Dar123 January 2, 2009

grumpass 

someone who is always negative and never
is happy

Why are you being such a grumpass?

grumpass by tigger August 10, 2003

grumpustiltskin 

A person who is constantly grumpy, or occasionally suffering from a very high level of grumpiness.

A grumpustiltskin, is a term used for a major grumpus.

(No link whatsoever to Rumpelstiltskin)

"I've been trying to talk to her all night but she has a face like a slapped arse, what a grumpustiltskin!"

"Mate, how's it going....

Fuck off,
OOOOOOHHHH alright grumpustiltskin"

grumpustiltskin by nwest1 September 9, 2012

Grumpiss

When you see a friend acting both grumpy and pissed. Call them Grumpiss and it will put a smile on their face!

"Hey, are you Grumpiss"
"HahHa what is a Grumpiss"

" you mutherfucker "

Grumpiss by anonymous June 4, 2016

Grumpus 

A girl; when she wakes up and she is grumpy.
She may punch you, or make rude remarks.
Generally the grumpus has blonde hair and green eyes, and pouts her lower lip when she is angry.

"Wow, she just woke up and hit me in the face, what a grumpus!"

Grumpus by dominikagirl November 4, 2009

Grumpus 

Marijuana that makes you grumpy when your with your friends or fellow stoners

Maan that weed must be grumpus, everyone is bein so custy

Grumpus by Ldogg and Kb December 7, 2003