The story
From funny + bunny + doll, referring respectively to the three avatars of Pomni, a jester-like character, Jax, a rabbit-like character, and Ragatha, a rag doll-like character.
Etymology from Wiktionary, CC BY-SA 4.0.
FunnyBunnyDoll
Today it means: The love triangle/OT3 of characters Jax, Pomni, and Ragatha from the web animation series The Amazing Digital Circus. Full definition →