The Collaborative International Dictionary of English v.0.48:

Draughthouse \Draught"house`\ (-hous`), n.
   A house for the reception of waste matter; a privy. [Obs.]
   --2 Kings x. 27.
   [1913 Webster]

Easton's 1897 Bible Dictionary:

Draught-house
   (2 Kings 10:27). Jehu ordered the temple of Baal to be
   destroyed, and the place to be converted to the vile use of
   receiving offal or ordure. (Comp. Matt. 15:17.)