A person who hides their true feelings and expectations about a romantic relationship in order to get closer to their chosen partner in hopes of coaxing them into a monogamous long term relationship. This behavior typically results in a surprise emotional outburst, catching one of the partners completely off guard.
I thought we had agreed that seeing one another wouldn't turn into anything serious, but he turned out to be an emotional ninja.
by PraxisMortem December 14, 2016