The opposite of emasculate. To grow one's balls back after they have been shrunken by an especially effeminate activity.
God, the girlfriend dragged me to go see License to Wed... it was terrible. I had to remasculate afterwards by watching Die Hard: The Bloody Retribution.
To have been rendered less of a man, or been made to feel much less of a man through humiliation. This term is most often used to describe a male douchebag who has been pussywhipped by his woman.
The fact that lame Ed has chosen to neglect his friends and be home before midnight on a Friday night is proof that he has allowed himself to become completely emasculated by his girlfriend.