Definitions by Dr. Tobor

Penile Flutter

An involuntary muscle spasm located in the male genitalia. This spasm can last for two to seven seconds, and causes can include sexual stimulation, sexual over-stimulation, urination, electric shock, or extraneous sensory perception. No medical attention is required, although you should contact your doctor if you experience a penile flutter lasting longer than four hours, or if redness or discomfort occur.

"Oh man, that girl at the end of the bar totally gave me a penile flutter."

Penile Flutter by Dr. Tobor March 4, 2011