JUPO Share definition Flag JU-PO/'joo,poe/Noun1. A perjorative term for a junior level programmer. "Look at this kludgy code... who's the JUPO that wrote this garbage? Looks like an 8th grader wrote it." JUPO by p1an0m0n March 1, 2013 0 0 Get merch Get the JUPO mug. Buy Now — $32.95 See more merch