Real Dictionary

toss
verb: If you toss something somewhere, you throw it there lightly, often in a rather careless way.
verb: If you toss your head or toss your hair, you move your head backwards, quickly and suddenly, often as a way of expressing an emotion such as anger or contempt.

toss in American English
to throw or pitch about; fling here and there; buffet
intransitive verb: to pitch, rock, sway, or move irregularly, as a ship on a rough sea or a flag or plumes in the breeze
transitive verb: to throw, pitch, or fling, esp. to throw lightly or carelessly

toss in British English
noun: an abrupt movement
verb: to throw lightly or with a flourish, esp with the palm of the hand upwards