Charlie Sheen blasted his former manager, Mark Burg, in a long Twitter rant calling him a "2 dollar wh*re traitor" and a "desperate piece of slime shite" -- later deleting the outrageous diatribe, but not before Breaking Celebrity News exclusively snapped a screen grab.

In the message originally posted on Jan. 8, Sheen directed his message to "Mark blurg!" and even challenged his once-trusted associate to come to his home to settle the beef between them.

As Breaking Celebrity News exclusively reported in Dec., Burg — along with publicist Larry Solters and entertainment lawyer Jake Bloom — resigned from their posts on Sheen's team because they were "unable to work effectively for Charlie."

"The bottom line was that Mark, Larry and Jake were unable to work effectively for Charlie," the insider told Breaking Celebrity News.

"He is too much of a loose cannon at the moment with his increasingly erratic and bizarre behavior and outrageous statements. He was refusing to listen to their advice and counsel."

Sheen, 48, insists he dumped the trio of associates, but Breaking Celebrity News learned the sensational spat between Burg