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"Gnaaa" is the sound a girl makes when a boy says or does something unexpectedly adorable or romantic. They probably will keep saying this up to 1 - 3 days.
Girl: "UGH I hate being me".

Boy: " But that's why I love you."

Girl: GNAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA.
by Phabiothearmadillo September 12, 2010
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