Broken Spanish
How do you say I speak broken Spanish in Spanish ?

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We don't have a literal translation of this expression, but to convey that meaning you can say: "Chapurreo el español"

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You could say things like:

Hablo un poco de español.
No hablo muy bien el español.
Intento hablar en español. 
Mi español no es muy bueno.

In my opinion, the above sentences sound better than any other literal translation.

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Y, finalmente, dicho de forma familiar (y políticamente poco correcto): hablar como un indio.

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If we make a literal translation, it would be "Yo hablo español roto" but we don't use this expression. I think you should say I speak bad spanish = Yo hablo mal español. It would be easy to anyone who speaks spanish understand that your spanish is not fluent.