Really, that's a bad word?

We were at a friend's house the other night, and one of the kids reported that Mo said a bad word. Mo, of course, vehemently denied it.

On the car ride home, he brought it up again, complaining that he'd been tattled on unjustly.

So I asked him what he said.

He tells me, matter-of-factly, "All I said was, 'What the f#@k?'"