Originiating from the movie of the same name. The idea is that if one's roommate at college were to suddenly die then that other person would get straight a's for the rest of the school year. For one can't seriously be thought to continue on with there studies if they are mourning the death of their roommate.

a phrase chiefly used in northern England.

it is a contracted form of "it'll be reet", where "reet" means "alright" or "OK".

living your life according to "be reet" is the only way to find happiness in life.