It means using two rhythms at the same time. A simple example is when you hear a metal drummer playing double-bass triplets over a bass’s quarter notes. It’s not necessarily written this way, but it’s like the drummer is playing a 12/8 time signature while the bassist plays 4/4.
Listen to this amazing [prog metal drummer reinterpret Nickelback](https://youtu.be/qcKJWJUL2S4?t=408). The original song is a straight 4/4 bass pump from the drummer. He gives it the double-bass 12/8 treatment. He plays every beat as a triplet, a quick1,2,3 / 1,2,3 / 1,2,3 / 1,2,3. He’s still in 4/4 on the ride cymbal. It makes it more energetic and adds fun complexity to listen to the layers.
They can get much more complex, and they add texture to music. You can kind of choose what to pay attention to and it breaks the music up into different feels, all playing together.
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