On fashion and style boards, EGL usually stands for "Elegant Gothic Lolita" - a Japanese fashion style featuring frilly, Victorian-inspired dresses and elaborate clothing with a doll-like aesthetic.
A flop house is a cheap, run-down lodging where people can rent a basic bed or sleeping space for a very low price, often in a crowded or unsanitary environment. They're typically found in urban areas and have historically been used by people with limited income or experiencing homelessness.