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A change of clothes, toothbrush, and other necessary items packed by a biddie before she leaves her home to prepare for an overnight stay to avoid the walk of shame the next morning.
Bro 1: Is Emily staying over tonight?
Bro 2: Yeah she is, how'd you know?
Bro 1: She left her Biddie Bag on your bed.
by Girafffe August 04, 2010
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