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Kyle Busch -- one of NASCAR's most hot-headed drivers -- has signed on for some professional help from Charlie Sheen ... on his TV show, "Anger Management" ... TMZ has learned.
Sources connected to the show tell us Busch just signed the deal -- in the last 30 minutes -- to play himself in one episode of the FX comedy.
Busch, the most successful driver for Joe Gibbs Racing, has more than earned his nickname ... "Wild Thing" with his antics on the track ... and off.
We're told Busch wanted to do the guest spot because he's a "giant Charlie Sheen fan" ... and loves the show.