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1.
Shorthand version of the phrase, "I am going to..."
I am going to -> I'm going to -> I'm gunna -> Imuna
Guy1: "what are we doin' tonight?"
Guy2: "iunoh, but imuna get smashed"
by NoUse4AName June 14, 2007
 
2.
I'm going to
Imuna start making dress down passes.
by The great Ant February 18, 2010