Yes, the audio above is Mel Gibson's now infamous racist rant at ex-baby mama Oksana Grigorieva, but for the first minute of the recording, the focus of Mel's rage seems to be Oksana's breast implants! Sugar t*ts she is not...but we definitely agree with the grumpy actor about the fake boobies!

Oh, and this just in -- Mel has been dropped by William Morris Endeavor Entertainment, his rep confirms to X17online. Gibson's longtime agent, Ed Limato, died on July 3, and earlier this week the agency informed the star that he would no longer be represented by them. Mel's publicist told us, "It is way too soon to be discussing agency representation out of respect to Mel's 30+ year relationship with longtime agent Ed Limato."