A penis with laser guided precision that locks straight to its target. It's been known to be somewhat predatory in some environments. It has been considered to be somewhat dangerous in ex Soviet states.
Be careful tonight, my radar says there are plenty of SSD (Straight Shooting Dick) out in the town looking for predatory targets to lock on to.
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?"