The bass synth? Start with a sawtooth wave as your oscillator, use a low pass filter with the cutoff fairly low and the resonance fairly high, and use an envelope on the filter to make the filter's cutoff raise quickly (but not instantaneous) and decay slightly less quickly to give you that "wOwww" effect. Raise the sustain a bit as well to prevent the filter's resonance conflicting with the bass frequencies on the way down. I think the example you posted has a subtle second oscillator at a higher octave to "phatten" it up, and keyboard tracking on the filter so the filter opens up as you play higher notes, but it's difficult to hear with everything else going on in the mix.
It's not a rare sound at all, it's one of the most basic patches you can make. A synth's internal filter design will determine exactly what you end up with (there's lots of different implementations that can sound very different from each other), but you can get well within the ballpark on just about any subtractive synth since the Minimoog (1970).
Side note: the formula for "wetness" is: resonance + rapidly rising and decaying filter cutoff = "wet"; it sounds "wet" because liquids often make sounds with similar characteristics to that, i.e. dripping water, stepping in wet mud, etc. The formula for "phatness" is multiple oscillators either octaves apart or slightly detuned from each other; thickens things up nicely, but can easily muddy up your mix if you're not careful. "Muddy" = too much going on in the bass frequencies of your mix, makes things sound incoherent and messy.