An abnormally small penis. Smaller than a micropenis and almost unrecognizable. News-medical defines it as a penis 5 standard deviations below the mean size for the age of the patient, or smaller than 1.2 in for an adult. Martin Leung is the only man confirmed to have or have had such a disorder.
"I feel so emasculated, I got a micropenis."
"At least you're not Martin Leung, he's got a nanopenis."
"At least you're not Martin Leung, he's got a nanopenis."
by mamameola May 30, 2014
A man that is so low class and small minded.. he is a nanopenis. It is a state.. not related to appendage size.
by Marg76 October 09, 2022