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1.
The slang word for an inhalant.

Person 1:Did moongas last night, you?
Person 2:Nothing but grass dude...
by David Moroe December 05, 2007
 
2.
Moonga-meaning "dark" in the aboriginal group of Australlia
Moonga's are trouble making, stubborn headed, up to no good,dogs. Moonga's are naturally sweet to other people but have a problem with body weight. they will bark when it is completly quite in a room, and have no problem doing everything they can to get what they want.
"That darn Moonga got into my purse this morning and ate my bottle of pain killers!"
by Moonga May 19, 2010