It should be noted before going into depth about this particular beverage that it's pasteurised. This is the process they put milk through in order to remove the bits of random cow bacteria that they figure won't be compatible with bits of random human bacteria it's likely to encounter. There's much more to it. But that's still enough to make me wonder what the sweet Christ is in Red Bull (or moreso is no longer in Red Bull) that required a massive dairy-based process to remove.
It looks like beer, albeit a bit browner. It fizzes tremendously upon being opened, and forms a brief head atop the beverage.
It smells like Combantrin worming medication. So, rest assured that while Red Bull may not give you wings, per-se, it'll quite likely rid you of worms. Seriously, though, this stuff smells vaguely toxic.
It tastes like vomit. Chefelf described it as bile, which is much of a muchness when it comes to internal fluids ejected orally. But yes. It's sickening. It tastes like a heavily carbonated combination of worming medicine and vomit. The reason this stuff initiates a gag reflex in me is, I fear, not due to its taste, but due to my body going "Hey, I know this flavour, it goes outward, not in!"
The illusion of consuming spew continues in the aftertaste, which cannot be described more efficiently than "it tastes like you just blew chunks". And possibly attempted to wash your mouth out with worming medicine to remove the taste of expelled bile.
It tastes like puke. With bubbles. And for some reason, I bought a four-pack of it.