noun. an upper-decker (crapping in the upper tank of someone's toilet so that when they flush a stream of shit-water comes rushing in) that was left by a short, heavy-set woman, usually of asian-american descent.
a: "yo, there's spring rolls and shit all in my toilet after i flushed"
b: "oh no, someone left you a panda sunset last night"
b: "oh no, someone left you a panda sunset last night"
by the_dutch_fist September 4, 2006