marcille_breakdance_(meme)
Marcille Donato going crazy and protesting in some breakdance-like handstands and head spins after Laios Touden's proposal of having a walking mushroom (dungeon meshi) as their lunch in Chapter 1. Unfortunately, the anime adaptation neglected the spinning and treated it like she was only doing a handstand.
One of many memes/emotes born thanks to her reluctance towards eating monsters, a running gag of the series.