Real Dictionary

bong
countable noun: A bong is a long, deep sound such as the sound made by a big bell.

bong in American English 1
a deep ringing sound, as of a large bell or gong
to make this sound
intransitive verb: to produce this sound
noun: a dull, resonant sound, as of a large bell

bong in American English 2
a water pipe for smoking marijuana, etc.
noun: a type of hookah or water pipe for smoking marijuana or other drugs

bong in British English 1
to make a deep reverberating sound
noun: a deep reverberating sound, as of a large bell

bong in British English 2
noun: a type of water pipe for smoking marijuana, crack, etc