feeding frenzy

Noun

 * 1) A wild, turbulent situation in which multiple sharks or other predatory fish attack one or more edible creatures simultaneously, in competition with each other.
 * When the terrified, bleeding cow was washed overboard into the river, the hungry piranhas entered a feeding frenzy, turning the water red with blood.
 * 1)  A voracious competition among would-be purchasers, etc. for limited resources.
 * The manager hesitated to open the doors to the thronging holiday crowds, knowing that a feeding frenzy would soon ensue near the display of coveted toys.
 * 1)  An event in which participants erratically grab and eat food.