A phrase commonly used by certain alien species which apparently makes sense in response to ANY statement. Some may think it is the gibberish version of the phrase "Oh, true" used completely out of context.

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.