Gaskarthism is the unoficial religion of Alex Gaskarth (Lead singer of All Time Low). People who are in this are mostly crazy teenie girls.
You: I love Alex's voice.
Girl at concert: OMG ME TOO! HE'S LIKE SOOOO HOT! LOLZ! THAT'S WHY I CAME HERE! DID YOU KNOW HIS MIDDLE NAME IS WILLIAM?! HE'S ONLY 20 TOO!
You: Dude. Are you like the leader of Gaskarthism?