Doing a Jamie is the act of getting wound up by a few 'scousers', a stoke twat and a man united fan here and there. Said person 'doing a jamie' will then leave the MSN conversation in an almighty mood; compared somewhat to that of a pre-menstrual female. Anybody who is 'doing a jamie' needs an apology or the world could end.
Chris says: screw you guys i'm going home!
Matt says: aww cmon chris stop doing a jamie on us