1) When a bunch of chickens are all together in a chicken coop and one of them gets flustered and this chicken begins to cluck. This damned clucking makes all the other chickens get flustered and before you know it, all them stupid chickens are clucking.
2) A disorganized event, similar to a cluster fuck, however, a splendid time was had by all. Shared misery with friends.
It's all just a beautiful fluster cluck 