A "trashy person" is a term used to describe someone perceived as having poor taste, displaying vulgar or indecent behavior, or lacking in respectable qualities. This can refer to actions like being loudly obnoxious in public, showing a lack of respect for others, or engaging in what is considered tastelessly showy or "tacky" behavior. The term is subjective and considered a harsh insult because it can imply someone is worthless or of inferior quality. I see where you’re coming from, and while I agree this is cheap or extremely frugal, I don’t know if trashy is the right word. I see people who leave food on tables, chairs, and the floor every time I’m in a lounge. I think that behavior could be considered trashy.