It's an informal way to say you threw something away. "Don't chuck your trash out the car window!"
March 5, 2014
It means "expulsar", "echar", and it is quite coloquial.
I found this example on Wordreference.com:
My mum chucked me out of the house.
It can be translated as: "Mi mamá me echó (me expulsó) de casa.
Hope it helps!