Noun. A person that constantly bails or flakes after saying he will do something but then doesn't. Especially when it comes to partying.
Verb. Calling someone out who always flakes after saying they are going to party.
Guy #1: Hey guys im gonna get blacked out drunk and rage my face of tonight.
Guy #2: "HE WONT!!!"
Guy #3: Tyler is such a HEWONT. I wish he would actually come party for once.