Other Head Meaning

(idiomatic, euphemistic, usually humorous) The glans of the penis.

Example: 2009, May Seah, "Top 10 television ignoramuses. Duh!," channelnewsasia.com, 7 Sept. (retrieved 10 Jan. 2010):
  We've had our fill of dumb jocks. But a dumb jock who's also a single-minded horn dog—that's funny. Thinking with his other head has gotten Jason into a lot of trouble.