It's referencing Facade, a procedurally generated breakup sim where you act as the catalyst for your best friend's divorce. You have a text box and you have to find the right things to say to make Trip and Grace hate each other and eventually get a divorce. Anyway, the word "melon" instantly gets you kicked out of their apartment.
Okay, Facade isn't a breakup sim, you're supposed to save their marriage, not ruin it. However, they're both massive assholes so it's more fun to ruin their lives.
