Smugeproof means it wont smudge. Like maybe if you rub your eye, it wont come off and smudge. Waterproof means, well, Its called waterproof, but with minimal water and no soap of course. Then you'll have the mascara for the rest of your life. lol. It will come out with water and soap, but perhaps not a a quick swim in the pool or a little cry, but it will come off of course. Hope that helps! :icon_chee