Onesy

Listen up, buttercup. The first part of the "joke" is play on words because "one-s-y" sounds like "onesie". It also implies that the person is incomplete. The second part is more morbid, where they are talking about how a star dies, but relates it to drug use, which is pretty messed up. I bet you didn't know that stars can live for millions or even billions of years, depending on their size and mass. The more you know!