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1.
Similar to the famous man cave, except it is upstairs opposed to the man cave which is usually in the basement.
Bro! Come on up to the Man Nest, where you will find beer, games, and a bunch of other cool shit.
by BMOC123 June 16, 2010
 
2.
What a man is left with when his girlfriend moves out and takes her mattress with her. This can be made up off pillows, covers, blankets, and what other comforting material is left accessible in the dwindling apartment.
My girlfriend just moved out so I'm not looking for anything serious, but if you want to come back to my Man Nest, I could show you a good time ;)
by BangTHEdragan March 20, 2011