Adjective used in place of a more crude phrase. Derives from Fat Bastard.
Fat dammit! That guy just cut me off, so I couldn't get off the ramp to merge properly. That Fat Bastard!
by Toxic Ink August 12, 2008
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a person with such a big fat ass that when people see them walking down the street, they say, "God dammit, that's a big fat ass."
"God dammit, that's a big fat ass."
by Russell Barker May 18, 2004
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