Cross between a squeal (of glee) and a tingle (due to encountered hotness) and possibly involving connotations of tinkle ('cause you're so excited that you sorta pee yourself a bit). Much like "squeal" and "tingle," skwinkle can be used as either a verb or a noun.
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.