A sycophant of author George RR Martin. Usually found vehemently defending him on fantasy forums or sucking up to him on the author's blog.
The term comes from the common abbreviation of Mr. Martin's name to GRRM and is pronounce the same as "gremlin." It can also be written "GRRMlin."
Me: Finish the book George!
Random GRRiMlin #1: He can take as long as he wants, he doesn't owe us anything. Read something else!
Random GRRiMlin#2: He is the best. I love him. I want to be with him. Forever.