Neither do I but if that is the case for you you shouldn't try to use it especially out of context. If you can't explain something in layman's terms then I've always said that you don't understand it yourself. I met guys at uni who would regurgitate a bunch of shit from a text book at you to try and impress you and make them look intelligent, I would always ask them what that actually means in layman's terms and not once was one of those who had did that were able to. I could always tell they were just trying it on. Somone who actually knows and grasps the concept can explain it in laymen's or very simple terms or analogies, if they can't then basically all they showed me was that there were as intelligent as a parrot.