As in, "I'm going to yewis a bit today." It can also be used as a noun or adverb: "I can't wait to hop on Yewis and express a controversial opinion"; or: "She spoke yewisly, with delicate regard for others' feelings."
This sort of thing arises organically, like mold on the pizza crust under your bed.
seeing this tag and going "oh what's this? :)" then getting slapped in the face with shady's good grammar is the worst thing that's ever happened to me — SilverNight