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By Lucy Bayly

Call it Starbucks and chill. But go slow on the espresso — because when it comes to summer drinks, it looks like orange is the new black. A new orange-mango-vanilla-coconut chilled beverage from Starbucks' "secret menu" has been setting Twitter on fire.

"This looks legit delish!" tweeted one approving Starbucks fan. "INSANE, go get it," recommended another. Customers likened the fruity fusion to an orange creamsicle, the soda fountain favorite that balances lip-smacking tartness and a soft, velvety finish.

But you won't be able to order this creamy concoction from the regular menu — for drinks this cool, you'll need to know the secret recipe.

"Orange Drink is not an official Starbucks beverage," a Starbucks spokesperson told NBC News via email. "If customers would like to order it they can ask for orange mango juice and two scoops of vanilla bean powder poured over ice and topped with coconut milk."

In fact, "in addition to the drinks listed on our menu, there are more than 170,000 ways baristas can customize beverages at Starbucks," the company told NBC News.

Looks like the easiest way to be chill this summer is to order "off" the menu.