noun
man-eater; seductress; femme fatale
Colloquial term for a woman who aggressively pursues and 'devours' men, often implying a predatory or insatiable attitude toward romantic/sexual conquests. Can be playful or derogatory depending on context.
彼女は有名な男食いで、何人もの彼氏をとっかえひっかえしている。
She's a well-known man-eater, constantly swapping boyfriends.
あの女優は男食いの役がよく似合う。
That actress often plays the role of a seductress.
Compound of 男 (man) and 食い (eating, from 食う 'to eat' in its metaphorical sense of 'to prey upon' or 'to consume'). The metaphor of 'eating' for sexual conquest is common in Japanese slang.