'Imma' has been around for some time. This summer, I stumbled upon an instance from 1968: Art Blakey Quintet's A Night At Birdland, Vol. 2 [Live], the end of track 4, Now's The Time: "Yes, sir, Imma stay with the youngsters. When these get too old,  Imma get some younger ones."

For the clip and more discussion, see Language Log: <http://languagelog.ldc.upenn.edu/nll/?p=2322>

Best,
Brett

-----------------------
Brett Reynolds
English Language Centre
Humber College Institute of Technology and Advanced Learning
Toronto, Ontario, Canada
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