Niss is everything. Instead of saying "She's tangled up in a bunch of yarn!" you could say, "She's tangled up in a bunch of Niss!" Usually it is used in place of a noun that you can't think of, or you can't explain. May also use nissyfoofoo as a plural form, just for a special thing, or as an exclamation.
That Niss is on fire!
Nissyfoofoo!
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