You totally came here because of Justin Bieber's tweet.
Anyway, it means Dirty Love and he was refering to Sean Kingston's and Nikki Minaj's song Letting Go (Dutty Love).
The best person you could ever hope for. They care about others more than they do themselves. Though they are looked over time and time again, but they wait in the shadows like a ninja waiting to strike. They also love Chuck Norris.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"