A hardcore bandwaggoner. Someone who hops on trends very quickly and without knowing what they mean or represent. Usually a huge poser as well as a tool.
Conor: Dude Jack just came to school with a bulls SnapBack on and he couldn't name one player on the bulls.
Robert: What a jack wagon!
Conor: Jack ordered a bunch of odd future clothes and when I asked him to name one person from odd future besides Tyler he said Nate Dogg. Are you fucking kidding me
Daniel: Thats because he is a huge jack wagon