Oh Gilly Gally Share definition Flag Similar to the phrases “oh boy” or “oh brother”. Used to express worry or contemplation (or conversation filler). Jill: ‘Jane just passed out’ Bob: “Oh gilly gally” Oh Gilly Gally by escapedlabrat January 4, 2021 0 0 Get merch Get the Oh Gilly Gally mug. Buy Now — $32.95 See more merch