To show embarassment,like blushing.
/ <-----Blush thing
2 fingers at the top of the nose between the 2 eyes. usually done by somebody who is so l33t that when a non-l33t person makes a stupid joke, he does -//-
sometimes this cannot be avoided and incontrolable, a lot of the times, another l33t person must come to the resque.
loser: What is green and has 3 legs?
another loser: uuuh... a crippled frog?
üB3rl337 P3rs0N: -//-