Top Definition
A 5-alpha reductase deficiency at birth causes ambiguous to female-type external genitalia. The male has undescended testes. The deficiency essentially prevents testosterone from becoming dihydrotestosterone (DHT). Now the penis-at-12 syndrom itself occurs around puberty when the high levels of testosterone overcome the requirement of DHT...the clitoris enlarges, alas, "penis-at-12".
Damn, I'm sure glad I don't have penis-at-12 syndrome.
by eleven April 27, 2003

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.