Ice Your Dice

To "Slow Down", "Stop", or "Wait up" when someone is falling behind. (Literally or figuratively.)

Charlie: "Hurry up, Sam!"
Sam: "Ice your dice, man. There's a pebble in my shoe."

OR

Emily: "-And then he was like, "We are so over", and just hung up. I'm so heartbroken!"
Julie: "Whoa, ice your dice, you two were dating?"