I know that 'On Our Own' verse by heartUnquestionably it's Bobby Brown. There may have been guys before him stated in the thread, but he was the Godfather of the R&B Thug lane
Always getting arrested, hard drugs user, bad boy, getting sexual with girls on stage, urinated on a cop car, etc.
Plus he was the first R&B artist to rap actual bars in a song on a regular basis. Perfect examples are "On Your Own" and "Every Little Step I take"
We should all bow down to the Godfather's influence