Charlie Sheen is not happy with Ashton Kutcher's performance on Two and a Half Men.

Sheen, who was fired from Two and a Half Men and replaced with Kutcher in 2011, praised his old co-star Jon Cryer on Twitter before launching into a rant about his replacement.

"hey Jon!!! u r a GENIUS!!! I elfin love and MISS YOU old pal!" Sheen tweeted. "Q; who's your lame side-kik?"

Sheen then addressed Kutcher directly in another tweet, writing:

"hey Ashton sorry bro all good. now quit barfing on my old brilliant show. Remember Punk'd? how duz it feel?"

Kutcher has not responded to any of Sheen's comments publicly. The actor has been starring in Two and a Half Men since Sept. 2011 alongside Cryer. The sitcom is currently in its 12th season on the air.

Sheen was fired from Two and a Half Men after a very public dispute with show runner Chuck Lorre.

Sheen made various negative comments about Lorre in the media including calling him a "clown" and a "turd."

Calling into The Alex Jones Show in 2011, he said, "I've spent, I think, close to the last decade I don't know effortlessly and magically converted your tin can into pure gold. And the gratitude I get is this charlatan chose not to do his job, which is to write."

Sheen and Lorre have allegedly made amends since the dispute, according to Variety.

Two and a Half Men currently airs Thursdays at 9:30 p.m. on CBS.

Tags: Charlie Sheen Ashton Kutcher two and a half men