The annual social gathering known as prom, for high school students all over the country come with some problems. Where is pre-prom? Where is after-prom? Who's buying the beer? Who's sitting at my table (etc). These problems and more have come to be known as 'promlems', because they are problems concerning prom.
i can only have 20 people at after-prom. what a PROMLEM!
those four people are being after-promlems