jollyous Share definition Flag Jolly with the 'ous' on the end, meaning something having a great aura or is rather happy, usually used towards an object such as a day. "Twas a jollyous day under the sun working like a pro" jollyous by sfreak March 28, 2005 0 0 Get merch Get the jollyous mug. Buy Now — $32.95 See more merch