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1.
The RATIONAL fear of clowns. Commonly and justifiably used to describe one's fear and disgust with yellow- or green-toothed humans, hiding behind white face paint and other heavy makeup.
Poncho: Hey daddy, can we go to the circus?

Daddy Mark: Sure, as long as we stay away from those creepy and disgusting clowns!

Poncho: Oh, of course, daddy. I'm afraid of them!

Daddy Mark: Yes, son. We both have, "Clownophobia!"
by MTinPHX September 02, 2011