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Green, tangerine-flavored, with Slimer on the box. Ecto Cooler was launched to cash in on the Saturday-morning Real Ghostbusters and then outlived the show by a decade, because kids didn't care about the tie-in, they cared about the color.
When Coca-Cola stopped paying for the license, the same drink was quietly sold as Shoutin' Orange Tangergreen, and without the ghost it faded away. In 2016 the company brought back the original name and box for the reboot film, and grown adults cleared the shelves.
The 2016 cans are collectibles now. The drink itself is basically Hi-C orange with a green food-coloring bill.
Sources: Wikipedia — Ecto Cooler