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(chiefly US, informal) contraction of I'm gonna or I'm 'onna, both being contractions of I'm going to quotations examples
So listen 'cause Imma come out.
Winwardo (rapper)
Yo, Taylor, I'm really happy for you, Imma let you finish, but Beyoncé had one of the best videos of all time! One of the best videos of all time!
2009, Kanye West, MTV Video Music Awards, Kanye West (actor)
I told you we should have gone with the mermaid costume. I'mma put this on -- 'cause I'm going to the race cause I feel better.
2017, Frankie Pamplemousse, “The No-Kart Race”, in The ZhuZhus