A club in which the only members are Chelsea, Ian, vampires and werewolves. This club consists of sitting in a circle, naked, eating pie and play on Nintendo DS's, after which it involves plotting against Bella Swan. Also, naked pie fights.
Origin: taken from the word 'super' and the word ]pro'. A common misspelling is 'supro', but that's just silly.
The Subro is so exclusive! I wish I could get in.