Enhance means in slang: Computer illiterates often use the term “zoom-in” to describe their belief that you can zoom in on blurred areas of an image and restore any non-existent pixels. This is a common use of it in television shows for the mentally disabled, such as CSI: Miami and NCIS, among many other. (in Slang Dictionary, added by Laylah Riley)
What else does Enhance mean?
Aim to improve or increase, particularly in terms of effectiveness, value or attractiveness. (in Merlin Dictionary)