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.

As his crew waited to get into Diddy’s crib, Bush said the RB rep started blowing chunks on the front lawn … right in front of a slew of security guards.

Diddy, of course, was indicted on sex trafficking, kidnapping and racketeering charges last month … with his alleged “Freak Offs” a major part of the case. He has maintained his innocence.

With all that said, Bush clearly feels like he dodged a bullet regardless … referring to his group getting turned away as a “sign.”