Not trying to pick a fight but-- Hitting on a kid when you're already engaged to someone? I'd call her slutty.
Doing it for the luls and to make your boyfriend jealous, I'd call her slutty.

I didn't call her a slut, but it's indeed a pointlessly flirty attitude. Don't you agree?

I think it's amusing since the "goth chick" stereotype... And it reminded me of Kishimoto's comment about Konan's outfit under her cloak, describing it "outrageous" XD