What does «papanatas» mean in Spanish?

Foolish and gullible man, easy to deceive.

Examples of use in Spanish: "es un verdadero papanatas, cree todo lo que le cuentan".
A man who is too simple and who is astonished by anything.

Examples of use in Spanish: "allá viene el papanatas de mi primo".
Mirón.
Zonzo, silly.
Typical of these people.

Examples of use in Spanish: "tenía un expresión papanatas".