"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…”