Mewing involves keeping your tongue pressed to the roof of your mouth to change your jawline's shape. When someone tries talking to a person that is mewing, the person will put their index finger on their mouth (the 'shh' gesture) and then put their index finger on where their jawline starts and run it down their jawline.
ex. "Dude! Did you see John Doe's jawline in the group picture?"
"Yeah! I heard he's been mewing!"
A term used by the average middle school boy that was no sense of humor. What is aura, you may be asking. It's a point system; the more aura points you have, the more girls you pull. You can lose aura from tripping on air, walking with your backpack open, etc. You can gain aura from helping someone, dabbing someone up successfully, etc.
"Bro! Brian just tripped on air! He just lost 1,000 aura!"
"Oh, but look! Scott helping him up! He deserves 10,000 aura!"