Nutter

Warning, the guy in front of you is a certified nutter!

Tom is a nutter.

He drives like a nutter! I'm not getting in a car with him.

Don't act like a nutter.

Don't act like a nutter!

Who is that nutter?

That bird who's hanging' out with you is mad like cat piss / Like bread and jam, or a knife going with butter / Face it son, your missus is a nutter!

When I asked Mr Robinson why he'd made his own attempts, he said, 'It gets to be a bug. And I suppose I'm a nutter.'

Nut Butter (Table Nutter) is also recommended.

Among the miscellaneous articles examined, 27 samples of vegetable fat resembling lard were purchased for analysis under the various names of nut lard, nut butter, nutter, palmine, &c. These were passed as genuine.