Juller
(n)A person or persons who talk about accomplishing things but never do. (v) the act of being a "juller" or "jullered" which is talking about doing something and never actually doing it or accomplishing anything.
(n) Don't be a Juller, finish the project. (v) We were so close to closing on the project, but go jullered at the last minute and ended up with nothing.