When your girlfriend's dad (or your dad, if you are the girlfriend) takes the boyfriend aside and gives him a good talking to. Usually includes a lot of posturing on the father's part, because he'll be trying to give the boyfriend a scare to convince him to treat the daughter well. In some cases can include sharpening a knife or polishing/cleaning a gun for a threat. Most often includes do's and don't's, but usually just don't's.

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.