To be fair, the video of the shooter had the upper half of his face.
And the guy they arrested has the upper half of his face.
Although I have the upper half of my face.
Do you have the upper half of your face? If not we can probably rule you out.
I certainly don't know what it is.
Never heard of it. Never seen a show with it, never read a book on it, or read up on it online.
In fact, those two words together? I ain't seen them like that ever, and I'm pretty sure it ain't English. Just like this guy, I ain't seen him do it. Ain't him.