Flustered and pompus, like you would be if someone asked you a question you find incredibly offensive. Happens a lot with teachers and snobby upperclassmen.

Another British bit of fun. Used in "Angus, Thongs, and Full Frontal Snogging" and "Harry Potter and the Goblet of Fire". See snogging.

Drunken (British) brawler. Taken from the general style of getting drunk, starting fights and wearing dress shirts.