A guy who can score some major ass in the gay circles. This word originates from the gay circles of Copenhagen and it has been used to describe the so called 'players' of the gay world
As well as being a conjunction of "smart fuck," smafuck is also:
The act of brown-bagging a woman, otherwise figuratively "cropping out" the woman's face prior to and during intercourse, as the term is derived from "smaf," hence "smafuck."