Literally: to have a nail fixed in the head. But don’t worry, not in reality!
Avere un chiodo fisso in testa means to be fixated on something; to have a mania, something that keeps our mind concentrated just on it. It could be something like “Jane thinks always about her boyfriend…she’s fixated on him!”
This is a common Italian slang! Would you like to learn more and more of them? Take a look to our Italian language personalized courses.
Are we talking about cats? Yes, you can say. The expression in fact means literally “four cats” and it’s used in Italian to indicate that in a particular place or situation were just a few people; an example?
“C’eran giusto quattro gatti al cinema” doesn’t actually mean that suddenly four cats invaded the cinema, but just that there was a little audience 
No cats around, then!
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(Delia Ciccarelli – La volpe dalla coda mozza)
It’s a funny colloquial expression, used in Italian to indicate someone with a guilty conscience in a friendly and light way. Its origin can be found in a popular novel: a young fox was caught by a trap. She could get away, but without her wonderful tail. Now, everyone knows that foxes beauty is represented by the tail, so the poor fox was really ashamed of her ugly stump. To make her happy, the animals of the wood created for her a fake tail made of straw.
None of the animal told this secret but an evil cock, which revealed everything to the farmer.
So the farmer, to keep the fox away from the hen-house decided to light some fire around it…and the fox couldn’t do nothing else than staying away from her beloved chikens.
When someone has a “coda di paglia”, means that he did something wrong and is afraid of being discovered…!
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