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What does clicking your heels together mean?

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Okay, so in an episode of Hannah Montana I saw this guy Jackson clicking his heels together and saying something like "There's no place like home".
I also saw this commercial on tv where this guy clicked his heels together 2 times and then he was like home sitting on a table eating this delicious food.

Mmm, I'm not from the US, so I had no idea what that meant, but I heard it had something to do with the Wizard of Oz? (I never saw that movie)
I just want to know, cus I've seen it several times on tv :D