a sound made in place of laughing, but usually used by drunken or extremely strange girls
molly: "isabel how are you drunk with your family on christmas eve?"
isabel: "big mansion. open bar. good hiding spots."
molly: "waga waga"
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The sound made by old school pacman
"waga waga waga... quick! into the escape tunnels!" - the pacman in futurama tales of interest
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to give your friend a fish while the are dancing to Mr. Beast's outro at nine at night.