Womanizer is a guy who gets every girl to like him. a gutless and senseless man who treats every girl like they’re the girl for him, then lets them down by having MANY other girls on the side.

Womanizer就是指到處討好女孩子，讓她們以為自己就是他生命中那個重要的她；可結果，他卻是個沒心沒肺、沒有真情實感，身邊有很多個女朋友的“洋蔥男”。
A womanizer is compared to an onion because he generally uses layer after layer of sweet words and other deceiving tactics to seduce a woman. But in the end, the romance comes to nothing, leaving the woman in tears when she finds out the truth.
之所以稱他們為“洋蔥男”，是因為他們通常用一層又一層的甜言蜜語和各種花招吸引女性。可最終結果往往是，女性竹籃打水一場空，唯有淚千行。