free-for-all

n.	1.	a noisy and disordered fight conducted without rules.
	2.	Any vigorous competition in which anyone can compete, with few or no rules, and in which the winner is unpredictable; as, when they began to distribute the free food, the orderly line of hungry recipients degenerated into a free-for-all.

Noun

1.

free-for-all - a noisy fight in a crowd Synonyms: brawl

brawl, combat, fight, fighting, scrap