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1.
The state of New Jersey.
John: (entering New Jersey) What's that smell?

Friend: Welcome to the armpit of the world.
by RealDuffy July 23, 2005
 
2.
Slang for the state of New Jersey (ironically dubbed 'the garden state')
I'm taking a train up to the armpit of the world to visit my family.
by meowmix666 August 05, 2008