This term is used when describing idiotic posh people.
Examples of these people may be the stupid twats you see in shows like The Only Way is Essex or Made in Chelsea.
These people try to act cool, then end up turning the whole situation into the most awkward thing ever. They are so, insanely stupid. This often happens when girls are involved.
They simply do not understand the language of teenage slang.
Examples of this behaviour; Will from the Inbetweeners.