SLAFS is a swedish word used for describing a mixed substance or thing which is often considered as repugnant.
SLAFS - Substance Located At Familiar Spaces
Swedish teacher(In swedish with broadscanian accent): "Jaa.. Man undrar ju hur musen klarade övergången från mus till fladdermus. Det måste måste ju ha varit rätt SLAFSIGT här vid vingarna."
Swedish teacher: "Well.. One can think about how the mouse suceeded in the transition from mouse to bat. It must have been quite SLAFSY here by the wings