Awesome, very good. Apparently coined back in the 1920's, but it is still in use today.
Spike: I don't believe it! After a huge setback, Applejack is back at the front of the pack!
Pinkie Pie: She's the head of the pack, all right. The pick of the litter! The CAT'S PAJAMA'S! Oh, wait! Why would Applejack take some poorkitty's PJ's? That's not very sporting of her.