Rickrolling began as a bait and switch prank built around Rick Astley's 1987 hit Never Gonna Give You Up, spreading widely online in the late 2000s. The sus half comes from Among Us slang that exploded in 2020, where calling someone sus became shorthand for playful suspicion. This version mashes the two eras of meme humor together, stretching the accusation before delivering the familiar chorus trick, which is why it still works for fakeouts, edits and joke reveals.