The negative form of question tag of 'am' is 'aren't'. Is it allowed in any slang of English using 'amn't'?

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The negative tag is always "aren't I". 
A literary way would be "Am I not?"
...but NEVER "amn't", not even in slang.

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'ain't' would work, but it is VERY poor English.

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What about "ain't"? That's slang and works.

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I have to agree with Eliot on this one

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No, "amn't" doesn't work for a very simple reason.

Try saying "amn't" in every possible situation where you think it would fit. Observe how tiresome it is to do so each time. ;)