The limited edition offering is a blatant attempt to troll the recent deluge of Insta-famous mythical animal-inspired drinks that've provoked such strong reactions. The company also made the conscious choice to pay homage to a real animal. As a brand spokesperson explained to us, "Arby’s loves unusual creatures too – but not the imaginary or docile kind. No, Arby’s loves real, powerful creatures."
So there you have it.
Like the very much real animal its named for (for those who haven't seen Napoleon Dynamite, a liger is a hybrid breed between a male lion and a female tiger), the milkshake is a hybrid of two Arby's flavors: Orange Cream and Ultimate Chocolate. As for the tiger-like swirled "stripes" around the inside of the cup, those are made using Ghirardelli chocolate sauce.