It isn't one of the seven dirty words George Carlin famously listed as being taboo for television. Still, it's not a good idea to use the invective on-air, particularly if you're speaking about the President of the United States.

Time Magazine editor-at-large and MSNBC contributor Mark Halperin learned his lesson today, when he declared during one of his regular appearances on 'Morning Joe'  that Barack Obama had behaved like "kind of a d***" during a press conference the president had given Tuesday.

MSNBC quickly acted to suspend Halperin indefinitely, calling his off-color remark "completely inappropriate and unacceptable."

Before Halperin made the comment, there had been jokes made about 'Morning Joe' having a seven-second delay -- possibly leading the pundit to believe his words would be bleeped out.

Nevertheless, Halperin has accepted the suspension, and released a statement offering a "heartfelt and profound apology to the President, to my MSNBC colleagues, and to the viewers."

Check out Halperin's gaffe below: