to suddenly change from happy-go-lucky and cheerful to moody and angst ridden. Often as a result of a breakup (such as Alanis Morisettes's with Dave Coulier)
Megan: NO, I don't want to go to the mall! I can't believe that stupid ass cheated on me. I don't think I'm ever going to be the same. I'm going to sit in my room and listen to angst-ridden music.
A: Did you know Alanis Morissette is Canadian?
B: Well, even if not ironically not being ironic or whatever, the fates sure have a curious sense of humor.
"Dude, that bar called 'Flare' totally burned down over the weekend, that's so Ironic!". "No man its coincidental, you're just Alanis Morisetting all over the place now"