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1.
The correct adjective is "callipygean", i.e. "having beautiful buttocks". "Callipyge" is the noun "beautiful buttocks", simple.
Her callipyge made me flabbergasted.
by Sérgio Rberto de Souza January 10, 2004
 
2.
A person with a gorgeous behind.
Dude1: check out the sweet retreat on that callipyge by the bar.
Dude2: yeah, shame about her face.
Dude1: she has a face?
by Claydogg August 21, 2008
 
3.
a person with a great ass.
All the scantily-clad female callipyges at the beach were causing him to pitch a trouser tent.
by weave September 21, 2003