Simple Simon

From the nursery rhyme of the same name.

Simple Simon (plural Simple Simons)

1. A fool, or gullible person.
   • 2003, Margaret Sanger; Michael W. Perry, The Pivot of Civilization in Historical Perspective, page 188:

     Now, will your kind of birth control select out specially for suppression the Simple Simons, the Peeping Toms, the Dumme Lisas? Oh, no, indeed.

• Simple Simon over
• Simple Simon under