SQUID is the acronym for a superconducting quantum interference device. It measures very small magnetic fields and is rendered useless when wet due to its very sensitive nature. Also, used as a massive Fuck You to all those pedant bitches who think it should be "squib". I mean, just who do you think you are? A 16th century musketeer?
Mate, you've not only missed the goal you've missed the ball altogether! Sometimes I think you're as useless as a damp SQUID.
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?"