A writer or work of slash fanfic that contains a multitude of pairings. Often used to refer to writers that will write any pairing, no matter how implausible, simply because it is slash and therefore good.
Derives from omni (all) and slash, the plethora of Final Fantasy 7 yaoi also likely playing a part.
"Don't bother with her work, she just writes omnislash."
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Slash (fictional guy paired up with another fictional guy) fiction, indiscriminately organized.
I'm writing omnislash fiction about Gordon Freeman and Master Chief kthxbai.