candle watcher
Someone who day-trades (stocks, options, forex, indices etc) and watches candles all day to make a living.
Friend: "What does your husband do again?"
Me: "Kavish? Oh, he's a candle watcher! It's not easy to watch candles all day, but someone's gotta do it."
Me: "Kavish? Oh, he's a candle watcher! It's not easy to watch candles all day, but someone's gotta do it."