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 poor kitty's PJ's? That's not very sporting of her.