Anti-Gnar

Something that is not cool at all. It can also be a person who is not cool, such as a tool. Substitution for loser, tool, fag, ass hole, etc.

If you're hanging out having fun and one person starts bitching or is silent and anti social the whole time they are an Anti-Gnar. If you're at a party and someone brings a bottle of vodka to a party and doesn't share or even pay to get into the party in the first place they are an Anti-Gnar.
If you see a picture online of a kid who thinks he's a G and he is holding up a bunch of $1 bills like he's a Mac he is an Anti-Gnar.