A sudden change in behavior commonly associated with the South Wales Valleys when a roider, such as Michael Layland, is provoked by a lack of Creatine.
Random Person: Alright like Mike?
(Speeding chav with heavy Bassline goes past)
Michael: Fucking Cunt!!!!
Random Person: Whats wrong?
Michael: Shut it or i'll fucking slam you!!
Random person: ooh Mood Swing!
Michael: Cmon Then!!!!
Random Person: Sorry Roider