A chaotic din caused by a crowd of people; confused noise or activity.
From Irish 'ababú' or Scottish Gaelic 'ubub', both exclamations of contempt or aversion. The word entered English in the 16th century, originally used to represent the war cry of Irish clans, later generalized to mean any confused outcry.
Hubbub perfectly captures that overwhelming sensation when multiple conversations blend into white noise at a crowded party. The word itself sounds like what it describes - that bubbling, burbling quality of overlapping voices creates the very acoustic chaos it names.
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