An activity involving matches being simultaneously flicked and lit. The matches are held like paper footballs against the striker on the matchbox. The middle or fore finger is then used to flick the match. This causes the match to be lit before flying off the box. Often played as a game with friends.
Never go dillywacking in the woods. You could start forest fires. Also, be careful not to dillywack into someone's hair.
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?"