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One of Forrest Gump-like disposition, lacking in basic cognitive and linguistic skills. Possessing a knack for having a constant look of bemusement on their face.

Also used to describe the language spoken/typed by a person of Gumpish disposition.
Matthew: "he ring up late not and got tell there is no problem with it."

Smithie: "Dude...that sounds so gumpish, what the hell are you talking about?"
Gumpish by Jellyfish December 16, 2005
Related Words
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

Grimpish 

The act of being generally repulsed by your own smell, and/or the smell of your significant other.
My god, I feel so very grimpish today
Grimpish by mapplethorpe123 May 6, 2011
adj. 1. considered to be excessive about walking, running or jogging. 2. preferring bipedal locomotion for environmentally conscious reasons. 3. pertaining to walking or running aimlessly with no particular motivation in mind, or simply for emotional release.
That gumpish dude took a 16.4 mile walk to the beach the other day!
gumpish by George Cotsonas April 23, 2008

grumpist 

making a joke out of a person that is grumpy.
Kim Kardashian is being such a grumpist, or grumpy this morning.
grumpist by 10bbruce August 20, 2016

Grumpist 

Making a joke out of some who is grumpy
Kim Kardashian is such a grumpist, or grumpy this morning.
Grumpist by 10bbruce August 20, 2016