A person who pretends to act happy for your successes than trash talks you behind your back. Someone who most likely dosen't have shit to work with and has to hate on people who move up in the world. This term could be used to describe anyone who hates on another person for 'good reasons. They will turn your good qualities around and make it look like something bad because they just arent happy with themselves and can't achieve anywhere near what you have.
Man, that Vitale is such a hater. He needs to stop drinkin that haterade and move on up in the world.