The term 'Adult Bug' refers to the final stage of a bug's life cycle, known as the Imago stage. This is when the bug has reached its full size and is ready to reproduce. The Imago stage is the last of the four stages of a bug's life cycle, which includes egg, larva, pupa, and Imago. During the Imago stage, the bug will mate and lay eggs, which will then hatch into larvae and start the cycle again.