REPORT: Mel Gibson's Racial Slur Latest Outrageous Outburst

July 2, 2010— -- Mel Gibson is reportedly at it again.

The Oscar-winning director and actor who caused a media storm four years ago over an alcohol-fueled anti-Semitic rant is again under fire for reportedly using a racial slur during an argument with his former girlfriend.

On Thursday, website Radaronline.com published transcript excerpts the site said came from an audiotape of Gibson telling his ex, Oksana Grigorieva, with whom he's battling in court over custody of their infant daughter, that the way she is dressed made her look like a "pig in heat.

"If you get raped by a pack of n***ers, it will be your fault," Gibson reportedly shouted at Grigorieva, using a deeply offensive expression for African-Americans.

Radar claims to have heard the tape, which it says Grigorieva recorded when her relationship with Gibson was unraveling. The tape reportedly also includes Gibson calling Grigorieva a whore, and other profane names offensive to women, and threatening to burn down her house.

Mel Gibson's attorney declined to comment and his rep did not return phone calls immediately.

Grigorieva's attorney Marci Levine told ABCNews.com that it was not her client's "desire that the tape be released." She declined to comment further, citing the legal proceedings as confidential.

Gibson, 54, and Grigorieva, 40, split up in April after they'd dated for more than a year. Last week, she filed for a restraining order against Gibson, claiming that he hit her at his Malibu home in January while arguing in front of their now 8-month-old daughter, Lucia. Sources close to the Russian-born singer claim that Gibson punched her in the face and broke her teeth.

But a day after Grigorieva filed for the restraining order, Gibson filed for his own restraining order. A judge upheld their recent custody agreement, which gives him overnight and unrestricted visitation rights.

"Oksana's deceitful conduct in trying to terminate Mel's access to his daughter continues," Gibson's lawyer, Stephen Kolodny, told TMZ.com Monday. "Making sensational allegations is not the way to resolve this."

Gibson, however, appears to be his own worst enemy. Here's a roundup of some of his past comments that have gotten him into hot water: