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1.
Binbagged is a term that has been around for a few years now and the first time i can recall hearing the phrase was when a mates girlfriend caught him playing away..

He came home after work to find all his gear outside their flat in the car park conveniently packed in black sacks..
Hello John, Sorry to hear she binbagged you..

John was binbagged by his girlfriend for being naughty and playing away from home.

John came home to find he'd been binbagged and she'd changed the locks.
by Nut-Magnet August 21, 2009
 
2.
The descriptive given to the dumped partner when a relationship has finished.

Thought to originate from said ex-partner returning to the home and finding his/her belongings gathered up and thrown into a refuse receptacle.
Steve, that's it, you're binbagged! Claim them from the back garden!
by barn door August 06, 2009