Under the rocks Share definition Flag A place people live that don't understand things that go on around them and are also oblivious to age old expressions. Aaron: "What does 'brass tacks' mean? Me: "WTF, Aaron, you live under the rocks!" Under the rocks by Lukarella November 3, 2015 0 0 Get merch Get the Under the rocks mug. Buy Now — $32.95 See more merch