1) The term used to describe someone of a peculiar nature or who acts/lives in strange ways.
2) Someone who shows obvious signs of belonging to the "indie" click, but also another. So a hybrid, one part "indie", one part something else, often considered weird.
1) "Hey, that guys a weirdie" (as opposed to that guy is weird)
Billy: That guy looks like an indie kid, no wait he's an emo.
Jean: That my friend is a weirdie!