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A gamallac is a term used for the great vehicle known as the Pontiac Grand Am.
Son, I don't think you want to line your car up against a gamallac.
by GamallacFan February 02, 2005
Another name for a pontiac grand am car. Given because the grand am is hood, gangsta, pimp, and just plain hot sauce.
"Playa, you see that gamallac rollin on 20's? That shit was tiiiiiight."
by Gammylover February 15, 2005