What is a smirk?
how do you do it?
A smirk is a slight smile often used to show amusement even though your upset. You just put one corner of your lip up in a smile.
Boys smirk when they just did something perverted.
What kingdomhearts said is exactly correct.
Smile with one side of your face, usually the side facing the person you're smirking at, and leave the other side neutral.
My smirks are like this: Me trying to hold in laughter and it turns into a half smile.