Nobody's fool: o que isso significa?

Do you consider yourself a very attentive person? For example, people may think you're easily deceived, but deep down only you know how much of an intelligent person you are. Suppose you have a brother-in-law that's always trying to take advantage of the family. This time, he's interested in borrowing some money from you and you know how much of a sly person he is. So you find a way to get rid of the situation and still continue to be okay with him. While talking to another family member, you say: If he thinks I'm falling for his tricks like the others did, he's very mistaken. I'm nobody's fool.

When you say you're nobody's food, you're a very wise person who's not easily deceived. Do you know someone like that? I've got an aunt that's always watching out for any possibility of deceptiveness. When she goes shopping, it's very difficult for sell clerks to talk her into buying something she doesn't need. She's nobody's fool. That's it for today. Take care!