A person whose entire life revolves around one
thing and who is perfectly happy remaining ignorant of real life and the outside world.
Like how a fish is perfectly happy inside of their
bowl, not even caring that there is an entire
ocean out there.
Jeremy is such a fish. All he does is go to the
gym, talk about the
gym, eat at the
gym, and think about the gym. Does he do anything else besides the gym? No, because he's a fish.