What does it mean when a guy smirks at you?

[malty]

1) When he's talking to you

2) When he's entering the room, walking slowly, knowing that he's approaching you but pretending to be looking elsewhere, with a grin/smirk on his face?

Could it mean nothing or something?

[michalezki]

he might be a shy guy, you no when you see someone you like you can't help but smile at them?

he might be a little modest. that sounds like the first signs of him being a little bit interested!

[icecreamlover]

looks like he has a crush on you but is acting cocky like he doesnt...so he won't be too obvious or something...