The first time I encountered the term "respect knuckles," I was playing *shudder* xbox with my friends, Chris and Daniel Pinney. Whenever a particularly skilled shot or a difficult kill is achieved, respect knuckles are given. Using respect knuckles pretty much needs to be at low speed. Used at high velocity and, for instance, to the face, they loose the admiration factor. UrbanDictionary.com has a great page on these awesome knuckles, and you can google around for other uses. Respect Knuckles... use them. Earn them.