An insult which is used against people who are clever. It doesn't make much sense because being clever is not a handicap. So all the people who use boff as an insult should try to do a sum which is easier than 2 + 2 , although I doubt their brains would manage it. Then they will find that being a boff is not such a bad thing. It is certainly better than being a chav
Chavette: OMFG ur such a boff.
Boff: Better than being a chav with no brains, like you.