Meaning:

“斩” is short for “斩获,” which means to “capture decisively,” “男” means “men,” and “色” means “color.” This term, coined by Chinese netizens, refers to certain colors of lipsticks that will reportedly help seduce a straight guy. The top color that falls in this category is said to be “nude,” represented by YSL lipstick No. 12, which is followed by pink, orange and scarlet. Although it looks like a cheesy sales gimmick, the term caught on and helped push sales of certain brands of lipsticks.

Example:

A: 最近有什么好唇膏推荐？

Zuìjìn yǒu shénme hǎo chúngāo tuījiàn？

Can you recommend me a popular lipstick?

B: 圣罗兰12号，据说是斩男色第一名。

Shèngluólán shíèrhào，jùshuō shì zhǎnnánsè dìyīmíng。

YSL lipstick No. 12 of course. This is said to top the list of lipsticks that can help seduce a straight guy.