An expression used to signify or express potent awesome-ness, of a caliber far exceeding "good," "great," "excellent," or any other mediocre expressions of approval.
(Upon arriving at the Grand Canyon)
"WOW, This Shit is Plasma, dude I've never seen anything like it."
(While busting out some dirty dance moves)
"Look at me go, This Shit is SO Plasma"
(Upon receiving your Brand New 90 inch LCD Screen TV)
"OH MY GOD This Shit Is PLASMAAAA!!"
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.