(as) cool as the other side of the pillow

slang Popularized by US sportscaster Stuart Scott.

1. Particularly calm, composed, and in control. Despite his opponents' aggressive defensive tactics, the quarterback remained as cool as the other side of the pillow and managed to complete 76% of his passes. Call Drew—he's always cool as the other side of the pillow about stuff like this. He'll help us for sure. I was petrified to take the stage, but Alice was as cool as the other side of the pillow.

2. Especially sophisticated, fashionable, or knowledgeable of the latest trends. Man, Jon is always as cool as the other side of the pillow. Look at those fresh new sneakers! A: "If we can get Tiffany to come to our party, lots of other people will come too." B: "Tiffany is cool as the other side of the pillow! Why would she even talk to two dorks like us?" You should talk to Maria—she's cool as the other side of the pillow and knows all the hottest clubs.