I'mma - what does it mean? i don't know!

Question

I'mma -  what does it mean? i don't know!

Answer

I'mma = I am a

It's colloquial english that is typed out...

No one types like this, but some people do talk like this in everyday speech

Answer

This is a terribly squished-up word.  You can stretch it out to "I am going to" (= I'm gonna = I'mma), so "I'mma talk to him" means "I am going to talk to him".

Here's an example from STAN by Eminem:

"If I have a daughter, guess what I'mma call her?
I'mma name her Bonnie."

Another variant is " 'monna " (again, "I'm gonna")

Answer

Sounds like African American English to me. 
I'mma = I'm going to...

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