noun
a compound word combining 'prom' and 'proposal', referring to a creative or elaborate proposal to ask someone to prom
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The young man spent weeks planning his promposal to ensure it was perfect.
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She was over the moon when he finally popped the promposal question.
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His promposal was so cute, she couldn't say no!
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His promposal was like a scene from a romantic movie, complete with flowers and candles.