Fix has the meaning of repair and also the meaning of solidifying in its present state. The photgraphic development process consists of three phases: the developing, in which the light exposed chemicals on the film are converted to a form that is visible to the eye; the stop bath, in which the chemical process in phase one is brought to an end; and the fixing, in which the new chemical state is made permanent.
Additionally, in (mostly) southern American English, fixin' to do something means preparing to do it, whether physically, by collecting the tools and preparing the workspace or, more commonly, mentally as in "I'm fixin' to get the lawn mowed rat now Honeybunch, jus as quick as I get done watching this here tractor pull on the TV."
And, Jackie, you sayin I kin git eggs an brains fer breakfast ther in Loouhv'lle?
