In the song "It Was A Good Day" by Ice Cube, there is this little beat that sounds like "koo-aw da hoo-haw." It is also followed by "bada da da diddly da." So if you hear some kid in the street humming this, you know what time it is.
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?"