This is a bouncy, self-mocking novelty indie-pop song about the person who reads the group chat backwards at midnight and hearts everything they missed, then rolls their eyes when somebody else does the exact same thing. The hook is the accusation you have definitely made out loud, and it lands here with all the warmth of a joke told about yourself: "Oh great, here comes the Reactor"1.
The verses are three versions of the same delayed reaction. One is the late-night catch-up itself — hehe, yay, heart heart heart, hearty heart heart, I love my friends 1. One is the inbox you open and then quietly abandon, because "I lowkey be leaving ppl on read cuz I don't know how to respond to them" 2. The last belongs to everyone whose comeback arrives days after the argument ended: "my brain needs three business days to come up with a response" 3. A bridge admits the pattern plainly. There is a whole sincere reply sitting in the drafts, and by noon it has been cut down to a heart.
The arrangement runs at 124 BPM on bright piano and keys, a rubbery bass, handclaps and compact drums, with a small synth blip standing in for every notification that starts this mess. The verses are talk-sung, the chorus opens up into something you can hum, and the bridge drops away to a voice and a keyboard before the last chorus comes back in.
Play it while you are three hundred messages behind, on the walk to the train with the phone face down in your hand, or in the group chat's defence the next time somebody reacts to everything at once. The wording stays close to the tweets, so each joke arrives the way it did in the timeline. The source wording and the credit belong to @jillboard, @shwiehwieeh and @delonperc.