A saying used by Jonas Brother fans, reffering to the Rap That Nick Jonas ocasionally does on stage called "Nick J is off the Chain" (watch it on youtube). Ususally just a thing Jonas fans say.
Positive: "Your speech was so awesome, it was off the chain!"
Negative: "Shelley hasn't been herself ever since she lost her job. I've heard she's at the bar getting wasted and taking a different man home every night. Homegirl is off the chain."