hella stupid 

Very stupid; extremely stupid; not having much intelligence.

Little Cindy is hella stupid if she thinks I'm going to pay her $20/hr. for sitting on her ass.

hella stupid by mikeg.com October 10, 2002

hella-stupid 

adjective : used to describe one who is a bad person, one who likes to lick camel bootyhole, some who is Cullinaning, or parents that are assholes

"They say I look bad and stupid because I have long hair, they are just hella-stupid."

hella-stupid by Pelolargo February 20, 2003