tempera tantrum

Refers to a noisy/voluminous outburst of frazzled-nerved emotion involving watercolors, either emanating from a creator/observer of a messy spill/soiling involving said paint, or the resulting preposterous canvas-creation (think, abstract art) when the "genius painter" supposedly experiences a "creative epiphany" and totally "goes wild" with his colors in an effort to supposedly illustrate his inspirations, emotions, Heavenly-based vision, etc.

Old-school art-critic: I can't believe that the TV auction actually sold that hideous tempera tantrum for several million dollars --- first of all, who in his right mind would even WANT that confusing monstrosity slapped up on his parlor-wall to stare at night and day, anyway?? And second, why should anyone want to actually BUY something like that, when it's nothing special and exhibits absolutely zero talent? Why, I'm no artist, but I could easily create something like that myself in under five minutes just by splashing some paint around and callin' it good! Zheeeeeesh....!!