The inverse of chav. A schweffe can be spotted around town often wearing a tweed jacket and red trousers. Aka a hooray henry.

when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life

Originally an English public school word with several meanings. For example, a guy who spends more time with his girlfriend than his mates or just a general idiot. But it has come to mean a public school idiot, since these people are the only ones who ever used the word.