It doesn't have to be a person and it doesn't have to have murderous intent.It is the act of removing something by throwing it out a window.
(
gronkpan https://twitter.com/VomitingLarry,
Sat 25 Aug 2007, 11:24,
archived)
I believe is more used for tossing out a personage:PBut, yeah, it can mean anything.
(
riverghost servicing your mum since,
Sat 25 Aug 2007, 11:41,
archived)