Hard

UK - Adjective: Slang for someone (usually a teenager or adult) who thinks they're cool, popular, and better than most people. Mainly used in a sarcastic setting.

Sometimes spoken as " 'ard " due to accent.

*Person1 throws a pen at another student*
Person2 - "Ooh you're hard aren't ya(?)"
Person1 - "What you gonna do about it?"