I realize this is posted as a comment below, but that is not an actual entry.
I actually prefer the spelling "Foucauldian." You've read the background information on Michel Foucault. Beyond that, the adjective that bears his name is often used to signify critiques of social phenomena that posit "power" or some outside, pseudo-marxist force, that acts on people at the individual level. So feminists claim "patriarchy" is a controlling force of history as well as the present. Foucault's work is above the textual level--he critiques society--more like a sociologist than a literary critic or philosopher (like Derrida). Foucauldian works likely do the same: critiquing outside social forces rather than works of literature or art. So, perhaps in the post-colonial film theory book, perhaps the writer may claim that a racist representation in a film is not deliberate but an effect of power--a power that serves its own purpose. And that the "colonial" reaction to that racist representation would not be "liberation" fighting against "repression," but the effect of power itself.It's Anti-scientific anti-humanism--people A) can't be objective; and B) don't have agency in the traditional way of thinking about subjectivity.
Hope this helps.