Two words placed before a gross insult. Implies politeness but then delivers a brutal slam dunk to the recipient. Very British.
Dude 1: "You worthless motherfuckin' dawg!"
Dude 2: "You sir, are a cunt."
Liverpool Fan: "Eh, eh! Stuffed yer arse in the Cup Final!!"
West Ham Fan: "You sir, are a Scouse Wanker."