A word referring to a proposal by either a male/femal to a prospective date for prom. "Promposals" can be as simplistic as passing a note or as elaborate as proposing with a flash mob with 10 friends in nothing but their underwear in front of the whole school.
Simplistic example of a Promposal: 'The Note/Text'
Bryan: "Hannah will you go to prom with me? Check 'yes' or 'no'
Hannah: "Can I have some time to think about this?"
Bryan: "Absolutely, take as much time as you need."
Elaborate example of a Promposal: 'The Post-it Car'
Bryan writes about one hundred different notes on 'Post-its' and places them on Hannah's car ensuring to have the words "Will you go to prom with me?" Somewhere on the vehicle where Hannah will notice it. The other notes are quotes, inside jokes, and any other thing that the proposer feels will help he/she obtain a date to the prom.