Same as schnickelfritz. Germanic origins. Usually used when speaking to a precocious young child. For example:
"Rowan! Your mother did NOT say you could stay up late tonight, you little fiddleforts! Don't be telling stories to your auntie silly girl or I think I just may have to tickle you!"
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.