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1.
In cuban slang, it refers to a slap on the face.
"Te voy a dar tremenda galleta si no te callas la boca"
by Yeinier Gonzalez April 16, 2008
 
2.
synonym of cracker

comes from the spanish word meaning cookie
Buying from QVC? You galleta!
by thenameisdita June 21, 2004