Don't make it wierd. Don't go up and just be like "hi" in a low voice with your eyes looking all over and act awkward. You gotta be like playful or amicable. It's no big deal if you seem a little nervous maybe because I dunno, I doubt he'll think it's that wierd he'll be happy a girl is talking to him. Just be smiley and like engage yourself in the shit. Be natural, you guys are casually talking it's not some formal shit.
"Nice shirt motherfucker"
"FUCK YEAH"
*high five*
A good world.
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ROW ROW FIGHT THE POWAH