Hulk Hogan is freaking OUT over screengrabs of his alleged sex tape that have leaked onto the Internet -- and now, the wrestling legend's taking legal action ... sending in his lawyer to clean up the XXX mess.
The black-and-white pics -- which appear to show a naked Hulk doing the nasty with an unidentified female -- surfaced on TheDirty.com last week ... and more pics followed.
But Hulk isn't taking the affront on his knees -- unlike a certain unidentified female -- in fact, his lawyer just fired off a cease and desist letter to TheDirty.com editor Nik Richie, demanding Nik take down the pics forthwith ... or face a lawsuit.
The lawyer writes, "As you know, should a sex tape or photographs of Mr. Bollea exist, they were taken without his consent and therefore the same would constitute a felony in the State of Florida."
We're told Nik and TheDirty.com have no plans to remove the pictures in question. Stay tuned ...