Definition of netties:
(n) :
A diminutive of the female given names Annette or Jeannette.
(n) :
(Internet, informal) An Internet user, particularly a Usenet user.
(n) :
Alternative letter-case form of nettie (“an Internet user, particularly a Usenet user”). [(Internet, informal) An Internet user, particularly a Usenet user.]
(n) :
(Geordie and Wearside) Alternative form of netty: an outhouse; a lavatory; a toilet. [(Geordie) An outhouse: an outbuilding used as a lavatory.]