What does it mean if your urine is blue my urine was blue on more than one occasion?

Blue urine. You need to check what you eat / swallowed/drank. Your question remind me old hospital trick when spirit was in use instead of denaturates that are in use novadays. Dye was admixtured to spirit making it look and taste not very pleasant. Those who however consumed this mixture had latter unusually colored urine.