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1.
a cache of money saved for a specific purpose (such as an emergency)
They went for the nest egg but forgot where it was.
by The Return of Light Joker October 06, 2009
 
2.
When a man's penis is so small it doesn't extend farther then his pubic hair.
Dude, that guy's junk looks like a nestegg.
by Thedung August 25, 2012