Lethal injection, usually in the context of animal euthanasia.

Comes from the greenish color of many medical syringes and the large volume of barbiturates they use to ensure a quick and certain death.

Sometimes capitalized or put in quotations for emphasis, i.e - "The Big Green Needle"

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"When I adopted Rover out of the animal shelter he was a week away from getting the big green needle, I'm so glad I found him in time!"

"It's sick how they dragged out Terri Schiavo's life that way. If she had been a dog they would have given her the big green needle years ago."
by Baroque T. Frankenheimer January 20, 2014
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Being completely screwed over, taking all sorts of crap, and being made to do rediculous shit.
SSgt: Formation 0430 and you're working this weekend.

Sgt: Well Boys. We're taking the Big Green Weenie. No Lube.
by CST069 October 28, 2009
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A massive candle filled with gains. It's literally an unstoppable force that smashes resistances and raises the floor.
"Dude, did you see that big green dildo? It totally broke resistance last night, it's exactly the type of pump we needed.
by Oddra the Odd March 29, 2021
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1. You can take a ride on my big green tractor y'all.
2. Hey there girlie wanna see what this big green tractor can harvest?

3. MY BIG GREEN TRACTOR IS GON WRECK
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