Definition of priapean:
(adj) :
Of, or relating to, an erect penis; phallic.
(adj) :
(Greek mythology) Of, relating to, or in honour of Priapus or Priapos (Ancient Greek: Πρίαπος), a minor rustic fertility god, protector of livestock, fruit plants, gardens, and male genitalia.
(n) :
(poetry) A kind of hexameter verse so constructed as to be divisible into two portions of three metrical feet each, generally having a trochee in the first and fourth feet and an amphimacer in the third; applied also to a regular hexameter verse when so constructed as to be divisible into two portions of three feet each.