What/Who is "Frick and Frack"? What does this mean? What's the origin of Frick, Frack, and both together?

I've heard people say this (Frick and Frack) in reference to couples and/or sticking together- For example: Bonnie and Clyde, white on rice, cards and dice, etc... Why? Sorry (correcting myself), I know WHY people say it but would like to know HOW this came to be a part of our language. Honestly, I... show more I've heard people say this (Frick and Frack) in reference to couples and/or sticking together- For example: Bonnie and Clyde, white on rice, cards and dice, etc... Why? Sorry (correcting myself), I know WHY people say it but would like to know HOW this came to be a part of our language.

Honestly, I haven't wondered about it 'til now. Just "popped" into my head.

Answers, anyone?

Thanks.
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