People told them they would not achieve success (it ain’t gon' rain), But now they have far exceeded expectations and are incredibly successful (soakin' wet).

The metaphor works brilliantly because the drop top car is another symbol of success in itself.

Andre3000 also reflects on how eager we are to have other define our reality. Like a weather man telling you it’s ot gonna rain and then you go out partying in your drop top wearing a silk suit.

The first line here could be an homage to the Wu Tang Clan’s Triumph (1997). Specifically, the use of a similar metaphor as the penultimate line of Inspectah Deck’s opening verse: “Stomp grounds and pound footprints in solid rock”. Dre might be saying ‘Wu!’ rather than ‘Whoo!’.

There is a long tradition in the American vernacular of characters bragging on their relationship to violent weather and dangerous animals. For example, in ‘Life on the Mississippi’, Mark Twain recounts the boasts of lumber boat roughneck: ‘Whoo-oop! I ’m the old original iron-jawed, brass-mounted, copper-bellied corpse-maker from the wilds of Arkansas!–Look at me! I ’m the man they call Sudden Death and General Desolation! Sired by a hurricane, dam’d by an earthquake, half-brother to the cholera, nearly related to the small-pox on the mother’s side! Look at me!’ & etc.

As a literary reference, it is worth noting that rainbows are, unlike most of the things in this song, actually listed as miracles in the Bible.

In the book of Genesis, God destroys the Earth with a global flood. Noah and his family survive, having been warned by God, and they preserve much of the existing animal life.

In order to reassure Noah (and everyone else) that he will never again flood the Earth in such a way, God then creates rainbows:

God said, “This is the sign of the covenant which I am making between Me and you and every living creature that is with you, for all successive generations; 

I set My bow in the cloud, and it shall be for a sign of a covenant between Me and the earth. 

It shall come about, when I bring a cloud over the earth, that the bow will be seen in the cloud, 

and I will remember My covenant, which is between Me and you and every living creature of all flesh; and never again shall the water become a flood to destroy all flesh. 

When the bow is in the cloud, then I will look upon it, to remember the everlasting covenant between God and every living creature of all flesh that is on the earth.

One can, legitimately, appeal to rainbows as perhaps the only example of a “miracle” in this song that is backed up by some form of religious scripture.

But let’s take a moment to look at the purpose of the song. We’ve been exposed to cats and dogs our entire life so they don’t seem miraculous anymore, but why are they more boring than a giraffe if you’ve never seen either? Also, the act of domestication is pretty miraculous too, isn’t it?

One more thing: I think it’s pretty amazing that giraffes have the same number of neck bones(vertebrae) humans do.