Slipstream can be defined as a kind of fantastic or non-realistic fiction that crosses conventional genre boundaries between science fiction, fantasy, and literary fiction. The term was coined by Bruce Sterling, a cyberpunk author: “… this is a kind of writing which simply makes you feel very strange; the way that living in the twentieth century makes you feel, if you are a person of a certain sensibility.”
Slipstream fiction is “the fiction of strangeness” in which cognitive dissonance is at the heart of the story inducing a sense of ‘otherness’ in the audience, like a glimpse into a distorting mirror and imparts a sense that reality might not be quite as certain as we think.
Slipstream narratives do not always employ elements of science fiction or fantasy, as they are not crucial to the plot, but provide setting and background. The common unifying factor is a degree of the surreal, the not-entirely-real, or the markedly anti-real.
It is certainly a little known genre to the mainstream reader but does have a loyal following. If you are interested in reading this genre here is a list: http://www.flashlightworthybooks.com/Best-Slipstream-Books/525