It's a pattern that's a bar of 4/4 and a bar of 2/4 and repeated (exception being a portion, the 'if you ask me, how should i know' part, that's just in 4/4). Relatively simple, but this band is great at making simple meters seem really off. They play it pretty loosely, especially live, and in typical Pinegrove fashion, the riff itself starts off during and emphasizes the beat just before the downbeat, so it sort of always gives you that instinctual feeling of being early, while the band remains perfectly in sync with one another. I love these guys so fucking much. "&" does all of what I mentioned incredibly as well.