Someone who is stupid, and who doesn't think before they act/speak. Spoonerism of "mentally retarded," and has come to mean someone who isn't retarded, but acts like it.
The inability to efficiently utilize the WashingtonMetro, mainly due to unfamiliarity with mass transit systems.
Examples of Metarded including riding the travel several stops in the wrong direction, switching trains at the Arlington Cemetery stop, and frequently missing,"doors closing, step back," by 30 seconds or less.
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?"