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What does it mean when you tell someone he's two for two? Although I'm not pretty sure is it "two" or "too".
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You have tried two things, and succeeded in both of them.

Unless you give more context, that's the best guess I can give you.
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The expression comes from sports, or maybe betting. It just means to have played twice and won twice: "Will she be able to go two for two in the match this afternoon?" means she's already won once, and if she wins again, she'll be two for two. She might be going "three for three" or "two for three" or lots of other combinations.

So, I'm guessing Clark has run into Lana once before, and now is seeing her again. She retorts that this is not intentional; seeing Clark is not a game that Lana is trying to win.
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Comments  
Well, here's the context:

Clark: Lana. What are you doing down here?
Lana: Probably the same thing you are. It's peaceful.
Clark: You're 2 for 2. You keep showing up when I least expect to see you.
Lana: I'm not trying to surprise you, Clark.

So, what does that 2 for 2 mean anyway?
 Delmobile's reply was promoted to an answer.
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