Haveing anal sex while falling out of an airplane while the other person has Mud butt (see mud butt)

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.

A certain act of anal intercourse while falling out of a plane, in which the reciever has a case of rampant diarrhea, resulting in fecal matter being scattered about, covering his or her partner, any passing-by avian creatures- and in a few minutes time, the Earth below- in the unpleasant substance.

It has never been documented of anyone attempting the actual act, but the phrase is still used to describe situations that are messy, disastrous, confusing, or 'royally fucked up.'