A male, over the age of 25, who is sexually attracted to many women and has sexual interplay with many of them. He does does not seek to have a commitment to any of them. His personal moral code is that women are for sex and entertainment.
The word does not apply to males younger than 25.
The word may also apply to a lesbian.
Women don't seem to understand that before a man can actaully mean he wants to commit, he should be older than 25 and he should have experienced being a womanizer.