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1) To have sexual intercourse with a douche bag.

2) To have sexual intercourse with a bag of something. Usually ended with a description of what is in the bag.
1). "Hey, are pregnant or just fat?"
"Fuck a bag"

2). "Wow you're really thin for a teen mom"
"Fuck a bag of nails"
by Brittany**<3 March 14, 2014
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