Charlie Sheen: Ashton Kutcher Is "Really Lame" on Two and a Half Men

Count Charlie Sheen among those who aren't fans of Ashton Kutcher on Two and a Half Men. The former star of the CBS sitcom slammed his replacement on Twitter Sunday, instructing Kutcher to "quit barfing on my old brilliant show."

The dustup started when Sheen tweeted a screengrab of Kutcher and co-star Jon Cryer with the message, "hey Jon!!! u r a GENIUS!!! I effin love and MISS YOU old pal! Q; who's your lame side-kik? C." Sheen also included the hashtags "#NiceTryCanonBoy" and "#CH," apparently a mistaken reference to Kutcher's commercials for Nikon cameras as well as Sheen's departed character Charlie Harper.

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Kutcher replaced Sheen on Two and a Half Men in 2011 following Sheen's epic meltdownand feud with creator Chuck Lorre.

After some fans lashed out at Sheen over the tweet, he clarified on Monday: "hey relax everyone! Read the hash tag! Oh and Jon I'm so sorry I insulted your sidekick I meant REALLY lame."

He followed that up with a missive to Kutcher directly. "Hey Ashton sorry bro all good. now quit barfing on my old brilliant show. Remember Punk'd? how duz it feel?" Sheen wrote, alongside a mug shot of Woody Allen from the movie Take the Money and Run.

Kutcher has yet to respond publicly.

What do you think of Sheen's comments?