He 'walks a/the razor edge' [='walks a/the fine line'] between humor and bad taste in his comedy.
It was a 'razor-thin' victory. [=a victory that was won by a very small margin or amount]
He's a thrill-seeker who likes living 'on the razor's edge'.
(..) -My turn. -Mama? Girl, we going to need some backup. Girl, call NayNay and LaQuanda. Tell them to bring the Vaseline and the straight razors. These bitches are on some other shit! What's going on? -Don't touch my dress! -Vandergeld's got Tiffany! What? No one messes with my queen! (..)2004 White Chicks