You're not cutting the mustard Share definition Flag A boomer phrase of undeterminable origin, It pretty much means you're wrong or bad. *Does something incorrectly* Boomer: "You're not cutting the mustard" Me: "Ok Boomer" You're not cutting the mustard by Abortea November 18, 2019 0 0 Get merch Get the You're not cutting the mustard mug. Buy Now — $32.95 See more merch