I painted mostly in the evening in summer and opened the windows widely hoping that the hot air stops torturing me. When the sun goes down, it becomes nice temperature to paint, but the thing is that the small flies from the outside come into my studio flying fiercely into the lights. Next day when i come back to my studio, all the little flies stick on my fresh-painted surfaces of oil paintings. They only love to stick on the fresh paintings, not on dry old paintings.
So I thought that fly stands for the new ones. F for Freshness.