OMFS Share definition Flag The Saying Of "Oh My Fizzy Soda" Created By Someone Named Sabastian. Commonly used when suprised! Guy 1 : Oh My god! I just found a 100$ bill! Guy 2 : OMFS! OMFS by Oh My Fizzy Soda August 10, 2008 0 0 Get merch Get the OMFS mug. Buy Now — $32.95 See more merch