Akin to moron. Is used to describe someone who is acting stupidly, or in a imbecile manner. Usually the use of the word is triggered by speech or an act of incredible idiocy; a feeling of cringe on the part of the accuser after witnessing the unfortunate/hilarious event is also common.
The fictional character David Brent in 'The Office' is a prime example of a chuff.
by metal_gimp March 27, 2008