The equivalent of "Smack Wally". An alternate form of the "Spot the Pony" title of features in young girl's annuals.
Doon MacKichan: "At first we called it Spot the Pony because that's what you have in those young girls' annuals. Then Kevin Lygo suggested Smack the Pony... People think it's a reference to something sexual but in fact it's a made-up thing."
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?"