grok in the fullness Share definition Flag To understand completely. To embody an I deal. From Robert Heinlein's "Stranger in a Strange Land". Take the Fonz. He doesn't just get women, he groks them in the fullness. grok in the fullness by Roger D. Reynolds September 26, 2004 0 0 Get merch Get the grok in the fullness mug. Buy Now — $32.95 See more merch