Why would a guy smirk at a girl?

[theguyisback]

...perhaps they all discuss together that they are attracted to you? That's the first thing that comes to my mind. I've talked to other guys in a group about a girl that is cute, and others would agree, then if she looks out direction, we would all have the "oh, she looked over here while we were talking about her" look on our faces, and would all end up giving the same confident "we weren't talking about you" smirk lol

[Evilpumpkinman]

they want to sacrifice your soul to the dark underlord

[Anonymous]

Define "Smirk" Please and Thanks!