n. An invitation to a prom, particularly one that is elaborate, unusual, or performed in a public place.
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Making a memorable promposal has prompted group serenades, Jumbotron questions, public address requests, flash mobs, airplane banners, cheesy public poetry, and tons of flowers, chocolates, and other gifts, including cupcakes with the question spelled out in icing
—Bella English, “With ‘promposals,’ excess is a competition,” The Boston Globe, May 17, 2014
The days of sheepishly posing the question to a girl are gone, replaced by a phenomenon known as the "promposal."

The question isn't popped on the phone or at a girl's locker, but in romantic settings such as Disney World or public places such as city streets and school gymnasiums.

Often captured by photo or video, promposals are promptly shared on social media, where they are liked, favorited and retweeted time and again.
—Adam Clark, “Lehigh Valley teens use 'promposals' to pop the question,” Morning Call (Allentown, Pennsylvania), May 04, 2014
2006 (earliest)
(n)- a proposal from one person asking another person to the prom.
—TexanJackass, “Promposal,” Urban Dictionary, January 22, 2006
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