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1.
1. The quality of being manly and masculine.
2. Also a slang term for the size of a man's genitals. In particular, it means that the bigger your privates are, the more "manly" you are.
Damn, Mark ALMOST won the heart of that hottiemonjaro girl at the club! Even though he impressed her with his manliness (having won a few barfights, showing off a few signature moves, his looks, and his muscles), he really did NOT impress her when he dropped his pants, revealing his small excuse for manliness!

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Mark H. Showing off my manliness at posting new slang defs at UrbanDictionary since February 2004.
by Mark H November 10, 2005
 
2.
What is epitomized in the book an alphabet of manliness. This is charecterized by any action such as kicking babies, beating hippies, chugging hot sauce, and getting tucker max drunk.
I am maddox, I often do random acts of Manliness.
by Ash Williams July 15, 2006
 
3.
To be of a very manly nature
punching a cow makes you manly, hence giving you manliness
by Kevin M Smith July 28, 2006