From The Collaborative International Dictionary of English v.0.48:
Gong \Gong\, n. [AS. gong, gang, a going, passage, drain. See
Gang.]
A privy or jakes. [Obs.] --Chaucer.
[1913 Webster]
Gong farmer, Gong man, a cleaner of privies. [Obs.]
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Gong \Gong\, n.
1. [Malayan (Jav.) g[=o]ng.] An instrument, first used in the
East, made of an alloy of copper and tin, shaped like a
disk with upturned rim, and producing, when struck, a
harsh and resounding noise.
[1913 Webster]
O'er distant deserts sounds the Tartar gong.
--Longfellow.
[1913 Webster]
2. (Mach.) A flat saucerlike bell, rung by striking it with a
small hammer which is connected with it by various
mechanical devices; a stationary bell, used to sound calls
or alarms; -- called also gong bell.
[1913 Webster]
Gong metal, an alloy (78 parts of copper, 22 of tin), from
which Oriental gongs are made.
[1913 Webster]