Gateau Share definition Flag 1.To be extremely ghetto2. When something is extremely ghetto Girl: Did you see shaniqua, going on all gassed about her new weave Girl 2: I know right?! And it looks so gateau as well Gateau by lwb07mb March 24, 2011 0 0 Get merch Get the Gateau mug. Buy Now — $32.95 See more merch