Meaning One:To act 'silly', 'foolish', 'stupidly' or in other words to act like a dork.
Meaning Two:Dorky is a WinBoard computer chess program for Windows.
A conversation between person A and person B:
Person A: Lol, why was the teacher so slack to the asian kid, saying "Two Wongs don't make a White."
Person B: ROFL, man that's so dorky.
A Nice girl, who doesn't hang out with the cool girls and maybe have more boy friends, she loves Sci-Fi, Superheroes and Video Games. Maybe also books and computers. She can be a bitshy, but is mostly really nice.
The quiet girl in the back of the class, who secretly goes home and plays Skyrim, but is to shy to tell anyone. That's a dorky girl!