What is Sehoon?
An attitude problem stemming from an inferiority complex, compensated by harassment of others on lude subjects; in order to have a sehoon you must have long, layered dark hair and an exorbitant amount of computer monitors on your desk.
"That guy has the worst sehoon ever, who does he think he is?"
"Knock it off you are really giving me a lot of sehoon right now!"
"That girl is totally sehooning right now."