1) A masterbater.
a) Someone who is a loser and can't get any, so they have no choice but to materbate.
b) Someone who has chosen to be celibate for religious reasons, but still has urges, and so quietly and privately masterbates from time to time.
c) Someone who gets plenty of sex, but is so super horny that they have to masterbate between fuckings.
2) Someone who is an expert, and possibly even a professional, at playing OTHER PEOPLE'S organs. A slut or a whore.
1) The Flying Nun loves to play her organ!
2) In CORVETTE SUMMER, Annie Potts played a professional organist.