Me and Marcus Allen went over to see Nicole
When we heard a knock at the door, must have been Ron Gold
Jumped behind the door, put the orgy on hold
Killed them both and smeared blood in a white Bronco

from Eminem – Role Model Lyrics on Rap Genius

In reference to the O.J. Simpson murder trial, where the famous retired football player was acquitted of murder (even though everyone believed he was guilty), Eminem confesses to the murder of Nicole Brown and Ronald Goldman!

The White Ford Bronco refers to O.J.’s attempted getaway before the trial got started

Marcus Allen is a former NFL player and sportscaster. O.J. Simpson was friends with Marcus Allen and asked him to lie for him in court and say he had sex with Nicole and Marcus and O.J. were still friends. This was meant to persuade the jurors that O.J. was not a jealous ex. Marcus refused and ended his friendship with O.J.

Originally this line was “Me and Marcus Allen was butt-fucking Nicole, when we heard a knock on the door…” The original line makes more sense because there is a logical gap between “went over to see Nicole” and “heard a knock on the door"
He was forced to censor this line like other lines from The Slim Shady LP like Just Don’t Give A Fuck and My Name Is and this line

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