Noun

1. A wild, turbulent situation in which multiple sharks or other predatory fish attack a food species simultaneously in competition with each other.

   When the terrified, bleeding cow was washed overboard into the river, the hungry piranhas entered a feeding frenzy, churning the water red with blood.

2. 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.