An organ superficially resembling a Penis in appearance, but does not function the same way. These can be found in both male and female animals, such as avians and hyenas.
This may be an enlarged Clitoris (Large Clitoris / Huge Clitoris), phalloid structures with vaginal anatomy (post #2881027), or a Cloaca when used for mating (post #3343597).
Used occasionally with Futanari to justify use of a penoid structure.