"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…”
Jan: "When we cry to our emotions come out in our tears?"
Mark: "God Jan that is such a hillaryism"
Sean: "I think I'm going to have a hamburger for lunch."
Sophia: "Why would you want a hamburger thats gross!"
Sean: "How is a hamburger gross?"
Sophia: "Ew because it's made of ham!"
Sean: SMDH *wtf hillaryism"