Gunna Share definition Flag The term you use when you already ate a lot, but u STILL hungry. The term was developed after gunna (Atlanta rapper) got his fat ass all over young thugβs birthday cake. π€¦π½ βοΈ βAre you hungry?β βYea Iβm gunna.β Gunna by Brainless- July 12, 2021 Get the Gunna mug.