Something that is fantastic, awesome, and especially extreme can be said to be "off the chain".
"I can't believe Joe got with three chicks that night, that is off the chain!"
Outrageous, unbelievable, out-of-control. (In both a positive or negative sense.)
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."
Wild; out of control
etym.: possibly derived from Fr. 'se déchaîner,' to burst out; to go wild; to arouse
"That set was off the chain, yo."
A way stupid people who think they're hip describe an awesome event, such as a party or concert. Often used by crackheads or Asians who think they're down with black folk.
Crackhead/Asian: Yo nigga, that party last night wuz off the chain, muthafucka!
Black dude/normal person: Shut the fuck up. (Beats his ass). Don't ever say that again.
Out of control, wild fun. Just like when your pitbull gets off the chain in the back yard and tears through the neighborhood.
I may be a 35-year-old white DJ from Maine, but this joint is off the chain!
(1) (Adj.) a great deal of fun
(2) (Adj.) very attractive
(1) Wow Mike, this party has punch and cake and everything! It's really OFF THE CHAIN!
(2) That girl has a nice rack. She is OFF THE CHAIN.
wild, raucous, or out of control. Originated from the onset of a dogfight, when the dogs are let "off the chain" and the event begins.
That shit last night over at Jamal's house was off the chain, money!