It didn't, it came from vocal processing and a lot of work on the recording engineers end.

I've wondered since the 80's what Rick sounds like w/o the processing? My guess is Tiny Tim combined with Milli-Vanilli. Poor Rob & Fab. I think that fiasco made MTV think seriously about moving music from the MTV platform to others it owned and and turn MTV itself into an entertainment channel.
Julie Brown couldn't "wubba-wubba" or shake her ass enough to cover the stench of that live event.