Ex-NFL star Reggie Bush says he would've attended a Diddy party back in the day if it weren't for a blacked-out friend puking before entering the bash ... but he believes his obliterated plus-one was a "sign."
The Heisman winner detailed the past experience in an interview with Robert Griffin III ... saying he was invited to a rager at Diddy's Star Island mansion around 3 or 4 in the morning, so he headed over with a group of friends and a Red Bull rep -- as he was sponsored by the energy drink at the time.