Usually found in schools or colleges, these pretentious son-of-a-bitches are always the ones who, when asked a question (usually by a teacher), like to exhibit their "intelligence" (narcissism) by giving long, overly detailed answers. These people fancy themselves something special and like to brag about how smart they are this way.
There's one in every classroom.

In the workplace, these sorts of people tend to give really detailed answers to casual questions, like when they are asked what they did that weekend.

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.