Former Vice President Dick Cheney's assertion that President Barack Obama is "dithering" on Afghanistan drew agreement from Rep. Joe Wilson (R-S.C.) -- after Wilson learned what that word meant.

Wilson, the lawmaker who shouted "You lie!" at the president during a joint session address to Congress, said he had to look up the meaning of Cheney's charge against Obama.

"I actually have to agree with Vice President Cheney, that the president is dithering," Wilson said in an interview with a conservative talk radio syndicate. "And I actually had to look up 'dithering,' and it means 'indecisive,' and that's exactly what he's being."

Cheney said Obama is dithering over a decision whether to send more troops to Afghanistan, as was recommended by the top U.S. commander in that country, Gen. Stanley McChrystal.