'gonna' is simply the informal oral form of ' going to' - sort of short form for lazy people...... (gonna is to going to what wanna is to want to)
Here are a few examples of 'gonna' mostly found in song titles:
You're gonna miss me A change is gonna come I'm gonna leave you We're all gonna die Baby's gonna cry |
You're going to miss me A change is going to come I'm going to leave you We 're all going to die Baby's going to cry |