womanizer; philanderer; lady-killer
Colloquial, often derogatory term for a man who habitually seduces women. Similar to 女たらし, but with a slightly more emphatic or playful feel due to the geminated った.
See also: 女たらし
He's a womanizer, always dating several women at once.
あの男は女ったらしだから気をつけたほうがいいよ。
That guy is a lady-killer, so you'd better be careful.