pri·a·pus 
(prī-āpəs)
(prī-āpəs)n.
1. Priapus Greek & Roman Mythology The god of procreation, guardian of gardens and vineyards, and personification of the erect phallus.
2. An image of this god, often used as a scarecrow in ancient gardens.
3. A representation of a phallus.
[Latin Priāpus, from Greek Priāpos.]