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An erection on a male who has only one testicle. Typically displayed in online chats or ASCII form as a U plus a seemingly appropriate number of pipes (|) followed by a D to indicate the head. The head may be preceded by two or more slashes (\) if a pulled back foreskin is present.
Man, I could totally see Lance Armstrong's One Ball Boner in that Tour de France spandex.
by stbn January 03, 2010

Words related to One Ball Boner

balls boner erection lance armstrong obb u|||||||||||\\d