Bibble

Noun - used to describe a person of inferior intellect or a person who's parents might be brother and sister. A bibble may have poor motor skills and may take on the appearance of someone with an intellectual disability. Bibbles lack common sense and are complete simpletons. Sloth (Lotney Fratelli) from 'The Goonies' is a bibble.

See also Mong, spastic, fuckwit, cockhead, idiot, simpleton.

1. I went to talk to this bloke and he was a complete bibble.
2. That town is full of bibbles.