toss

Concise Oxford English Dictionary © 2008 Oxford University Press:
toss/tɒs/

▶verb

• 1 throw lightly or casually.

  ■ (of a horse) throw (a rider) off its back.

  ■ throw (a coin) into the air so as to make a choice, based on which side of the coin faces uppermost when it lands.

• 2 move from side to side or back and forth.

  ■ jerk (one's head or hair) sharply backwards.

  ■ shake or turn (food) in a liquid, so as to coat it lightly.

• 3 (toss something off) drink something rapidly or all at once.

  ■ produce something rapidly or without thought or effort.

• 4 (toss oneself/someone off or toss off) Brit. vulgar slang masturbate.

▶noun an act of tossing.

– phrases
give (or care) a toss [usu. with neg.] Brit. informal care at all.
take a toss fall off a horse.
toss one's cookies N. Amer. informal vomit.

– origin C16: of unknown origin.