To cry loudly and dramatically; to weep in a theatrical or exaggerated manner.
Imitative or onomatopoetic word representing the sound of loud, exaggerated crying. Used in English since at least the 18th century, possibly influenced by 'boo' (an exclamation).
The word 'boohoo' is onomatopoeia designed to mock crying—saying someone is 'boohooing' makes their tears seem theatrical, which is why it's often used dismissively but also affectionately.
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