It is a derogatory term used to refer to a stupid or foolish person.
It's important to note that using this word is extremely disrespectful and could be hurtful to the person you're talking to. It's better to avoid using it altogether.
If you're looking for a more respectful way to express that someone is not intelligent, you could use phrases like "not very bright" or "not very clever."
Remember, words have power, and it's always better to use them responsibly and respectfully.