A combination of the words "smart" and "serious" usually used in a sarcastic form. Originates from the sentences "are you serious?" or "are you smart?" indicating that the answer to the subject is obvious.
Sally- "I locked my keys in my car! And I'm getting worried because it's starting to rain and the top is down!"
John- "Are you smearious?"
Tw(blackness):i got this new anime plot. basically there's this high school except she's got huge boobs. i mean some serious honkers. a real set of badonkers. packin some dobonhonkeros. massive doboonkabhankoloos. big ol' tonhongerekoogers. what happens next?! transfer student shows up with even bigger bonkhonagahoogs. humongous hungolomghononoloughongous
disclaimer: i did not make this