A person who can continuously annoy anyone by asking stupid questions and/or doing stupid things. They think they know it all and they can sometimes be funny. Usually have blonde hair or red hair.
Bob is such a merpadoodle. He just tried to do a backflip off the trash can, it tipped over and he fell and hit his head.
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?"