nincompoopsicle Share definition Flag 1. A nincompoop who puts Popsicle up his/her butt! 2. A person that tried a poop flavored Popsicle. Bruh, Stop putting popsicles in your butt you absolute Nincompoopsicle! nincompoopsicle by Betty Brave May 27, 2020 0 0 Get merch Get the nincompoopsicle mug. Buy Now — $32.95 See more merch