What does ''Chammak Challo'' mean?

Chammak Challo is a song sung by Akon and Hamsika Iyer of the Indian movie ''Ra One''. I really wonder about the meaning of Chammak Challo. It's a Hindi word. Can our Indian friends please say the meaning?
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Maybe I'll Even Letcha Be My Chamak Chamak Chalo
What does ''Chammak Challo'' mean?
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