Early 21st century slang for "hardcore" or "hard core" brewed within the online graphic design community.
Associated with words such as "fohk", "kohk" and "rohk", created by the same people and incorrectly credited to Nick Delaney, some punk-ass bitch/ designer wannabe.
It is also the name of a digital photographers collective: The Hardkohr Group (aka Hardkohr Globaal).
Nick Delaney is a hardkohr impostor.
He will get pwned hardkohr for his lies.