Grelvish

Grelvish refers to a pseudo-Elvish pidgin used by a fantasy role-play collective known as The Grey Company (a.k.a. tel'Mithrim). The word is a portmanteu of "Grey [Company] Elvish," and almost always used as a pejorative.

Grey Company Elvish is derived from Tolkien's Elven languages, primarily Quenya, but its vocabulary is expanded pell-mell, and its grammar and syntax are simplified along English-language lines to the point where it barely resembles actual Elvish in the eyes of Tolkien fans. Characteristics of Grelvish include Quenya or Sindarin words taken out of context, double-vowels and double-consonants that would never appear in Quenya or Sindarin, and an overabundance of apostrophes.

In tel'Mithrim's defense, their pidgin Elvish was never intended to represent authentic Middle-earth Elvish. However, their language page tended to come up near the top of any web search for "Elvish" during the time the Lord of the Rings movies were at peak popularity, and it looked legit if you didn't scroll down to the bottom of the page and investigate any of the authentic Tolkien language resources listed there. Thus, Grelvish was picked up by new fans who didn't know any better and didn't stop to check their sources before including it in their fanfiction.

Grelvish and the PPC
By association, "Grelvish" is sometimes used to refer to any pseudo-Elvish in a fic. Using Grelvish names, words, or phrases and calling them Elvish in a continuum with a canonical Elven language—especially The Lord of the Rings—constitutes a charge.

"Sue-Elvish" was first documented in the mission "All Souls Night" by Jay and Acacia, in which a Sue said "Kenltra morich aradai," which isn't even Grey Company Elvish.