Top Definition
When a boy (in the mental sense) goes through a dramatic transformation to become a man's man.

This may or may not involve things like working out consistently and losing weight, learning to finally respect what women have to say, spending thousands of dollars on a new wardrobe, and sporting a pair of hipster glasses.
Wow, if Paul never had his manissance, he might have died from playing StarCraft 2 all day long.
by theliuman July 03, 2014

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