Watson,

Upon reassessment of the clues, I have changed my mind.

My secret Santa is male and lives in OZ, hence the phrase, "no worries" ala Paul Hogan. He is of average height, greying at the temples, and slight paunchy from over indulgence in Foster's. Small scar on forehead from crushing beer cans. He plays the guitar but never, never sings "Waltzing Mathilda."

Well, Well, Santa, am I getting warmer?