any pen, specially a gold ballpoint pen.

a writing tool that uses ink; a pen

A writing utensil, usually filled with ink. Used for writing and drawing all around the world. See pen. The word frindle was first introduced in the Andrew Clements book Frindle.

Noun: an object you use to write with (see pen)

A pen from a book called "Frindle"

Another word for pen
can be used to annoy teachers and adults instead off saying pen

Basically Any Pen, But is Typically thought of as a eraseable ballpoint pen. Also A word From the Book, “Frindle” Go read it. It’s about a boy who makes his own word, frindle and almost gets expelled by the teachers because of frindle being somehow Stupid.GO READ FRINDLE