1. Ready to go, or ready to use. Often used after assembling something, or accessorizing something. (typically a vehicle.)
2. Ready to step out or leave.
1.Dude, I just added a new exhaust to my ride. Now all I need is the intake and it's good to hook!
2. "Just lemme grab my shoes and jacket and I'm good to hook!"
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good to go/all set; military slang often used by paratroopers/commandos referring to their parachute rigs and being good to go to 'hook' their static line up for a jump
once we get this part done right here we're good to hook