Grobeds Share definition Flag Ugly creatures that hide under your bed and grow when dirty laundry is shoved under the bed and into their mouth. (n) The boogeyman, the sandman, "that monster under my bed"The grobeds ate my homework! Grobeds by Ann & Allegra June 24, 2009 0 0 Get merch Get the Grobeds mug. Buy Now — $32.95 See more merch