I often hear "I'm gonna". but sometimes I hear "I'm ona" pronounced by a native speaker as "I'm gonna". Dose it make sense?
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This is an example of elision, where consonants and even whole syllables can be lost to make a word easier to say quickly.
In fact, even I'm gonna is an example - it is an elided form of I am going to. I'm ona and I'ma are just taking the elision further, but this isn't necessary.
It should be noted that even I'm gonna is colloquial, familiar language and can seem childish/uneducated - I'm ona and I'ma even more so.