I'd say that VIBE=ENERGY that the crowd produces at a certain place. Some clubs have really strong happy vibes (PVD at Twilo), everywhere you look all you see if smiling faces and you FEEL that happiness along with the rest of the crowd. Some places have really negative vibes (no example ), where you walk in and you don't feel comfortable. Personally, a bad vibe for me is when ppl look you up and down, judge you based on how you're dressed, who you come in with, how you dance.. all that. Or be disrespectful like grope you everywhere, be rude and not apologize when accidentally push you.. Just something that leaves a not-so-pleasant feeling inside when you leave. It's definitely one of those things you FEEL and not see or hear.