Like "fuck yeah", score big emphasizes a big accomplishment and is usually stated when excited.
You asked her out and she said yes??? SCORE BIG!
Something Dutch needs to get to the promise land of Tahiti
Dutch: “One more big score we got enough money to leave!”
Aruther: “I don’t know what you’re sayin Dutch but it seems like I heard it all before!”
Dutch: “JUST ONE MORE TRAIN!”