ninnyhammer

‘Well, if I don’t deserve to be hung on the end of one as a warning to numbskulls! You’re nowt but a ninnyhammer, Sam Gamgee: that’s what the Gaffer said to me often enough, it being a word of his. Rope!’

‘If you can think of any way we could have both used the rope and yet brought it down with us, then you can pass on to me ninnyhammer, or any other name your Gaffer gave you,’ said Frodo.

"You ninnyhammer," said she to her son, "you should have carried it on your shoulder."

Here, help me! the other side, ninnyhammer!

That will do, Direxia; you mean well, but you are a ninnyhammer.