Comedian and actor Joel McHale, host of 'The Soup' and a star in 'Community,' majorly dissed Justin Bieber, calling the 19-year-old pop star a 'f--ing idiot' during McHale's Jan. 14 appearance on 'Conan.'

"Why is one of the most affluent stars in the world right now throwing eggs at his neighbor's house?" host Conan O' Brien asked McHale, referring to the claims made by Bieber's neighbor that the singer pelted his house with eggs.

"'Cause he's a f---ing idiot," the comedian replied, the audience erupting in laughter and cheers. (We guess he hadn't heard about the Biebs suing the last person who called him an idiot.)

"I feel like he's got all those guys around him, he's just running out of things to do," McHale elaborated. "He's so rich and so successful, and it's like, 'What do you want to do?' 'Let's shave a dog, what do you want to do?'"

While McHale poked fun at Bieber's "1950s-[era] pranks," police raided his home in the egg-throwing case, finding the ecstasy drug Molly and arresting his friend Lil Za twice in one day.

Watch Joel McHale Diss Justin Bieber on 'Conan'