On the tape, a man who sounds like the “Braveheart” star is heard accusing a woman of lying to him about her breast implants. As the argument progresses, the man uses increasingly graphic and sexist language to criticize her appearance.
"They look like a Vegas whore. And you go around sashaying around in your tight clothes and stuff. I won’t stand for that anymore,” the man says.
NBC has not verified the authenticity of the recording, which RadarOnline posted on Friday. Gibson's spokesman and Grigorieva's lawyer have not commented on the recording's release.
Radar reported the alleged existence of the tape last week, claiming Gibson said at one point during the argument: "You look like a F------ pig in heat, and if you get raped by a pack of [racial epithet] it will be your fault."
That exchange was included on Friday’s clip.
“I don’t want you. I don't believe you anymore. I don’t trust you. I don’t love you,” the man says at the end of the argument.
The alleged incident occurred Jan. 6 at the 54-year-old actor's Malibu residence, according to the sheriff's department.
In 2009, Gibson left his wife of 29 years and the mother of his six children to be with Grigorieva, 40, a Russian pop singer.
Since their relationship soured in April, the pair has been locked in a custody battle over their 8-month-old daughter. Last week, their lawyers met in closed session with the judge handling the case, The Associated Press reported.
Grigorieva recently won a restraining order against Gibson, claiming he punched her and broke her teeth, a charge Gibson has denied.
Back in 2006, Gibson's career was nearly derailed when he went on an anti-Semitic and sexist rant against the officer who arrested him for driving under the influence.
Earlier this week, Gibson was dopped by his agency, William Morris Endeavor Entertainment, according to Hollywood Reporter.