"Hilaristurbing" (adj) used to describe
something that is both HILARious and dISTURBING.
It's origin is from an online story written by
Alexandra Erin called "Tales of MU".
In the story - an adventurous nymph named Amaranth describes her attempt to teach a
horse to count with the intent to avoid her deity's prohibition against
lying with unintelligent beings. Chapter 60 - Leather
“Hey, I just discovered a new adjective,” Steff said. “‘Hilaristurbing’.” She turned to me. “I
think Amaranth has exited the dungeon, hon…”