She seems to be a little 'unclear on the concept' of good manners. [=she seems not to understand what good manners are]
a 'concept album' [=a collection of songs about a specific theme or story]
a 'concept car' [=a car built to test or show a new design]
(..) I didn't have them, you did. All right, so I had wooden teeth. So what? So... So nothing. Nothing. Apparently Plato... ...who came up with the concept of the platonic relationship... ...was pretty excited about it. He named it after himself. He said, "Yeah, I got this new thing. Platonic. (..)1990 TvShow: Seinfeld Title: The Stakeout Season: 1 Episode 2