From the 2004 movie, Mean Girls.
When Damian is passing out candy canes, he says, "Taylor Zimmermann, two for you. Glenn Coco? FOUR for you, Glenn Coco! You go, Glenn Coco. And uh...'Caddy' Heron. Do we have a 'Caddy' Heron here?"
People quote it today when they feel like something you did is to be proud of. Weather they are being serious or sarcastic is for you to determine.
You: "I aced my Calculus test!"
Them: "You go Glenn Coco!"