A stupid form of "dancing" done by emo kids at "hardcore" shows cause they're too sissy to actually mosh. The saddest part about it is that they actually think they're cool when they do it, when in fact it's the complete opposite.
Stupid Emo - "The Aiden show last night was amazing! I was hardcore dancing the whole time! I'm such a badass!"
Non-Fag that doesn't hardcore dance - "Wow. You're an idiot."