A person of snob like nature with a narrow minded approach to everthing other than material stuff, some body hu is a posh twat is often dislicked and bitched about heavily due to their superior attitude to people they consider lower than them, they are often found in eastern areas of cheashire UK and are most concentrated in areas such as alderly edge and wilmslow. Posh Twats are in many cases the children of people who have worked hard for their money and thus havnt worked a day in their life, but some how have a BMW/auto-motive form of transport of higher value than my 1.2 corsa which i share with my gran!

Posh Twats are a minority, many americans and other members of unfree slave populations beleive (because of their stupidness) that all English people are posh twats, this in fact is itself taking a posh twat attitude and they shoud all roll over and die!!!

An exclamation made when your friends or family are teasing you to a point where you can't handle it anymore and a hissy fit is in order.

Derived from a YouTube user's famed outburst following Britney's lackluster performance at the 2007 VMA's.

A person, generally a guy, who lives in Hampstead or Highgate and thinks they are a badaman, but really, are just a posh twat.

Basically, and with some variations..
A posh twat is an incredibly blonde girl, who, though dislike by most, thinks everyone wants to be them. Don't be fooled though, their only friends are each other. Role models include The Plastics and Paris Hilton. Posh Twats exhibit behavior such as pretending to be bisexual so people pay attention to them, continually repeating how they "dont care" what you think of them, and taking myspace pictures with weird pouty expressions.