fell off the turnip truck Share definition Flag Dumb. Stupid. Implying that you've been isolated from the world (on a turnip farm). He understands what you're saying. It's not as though he just fell off the turnip truck. fell off the turnip truck by Shminka May 28, 2016 0 0 Get merch Get the fell off the turnip truck mug. Buy Now — $32.95 See more merch