Meaning:

“BM” is short for the brand name “Brandy Melville,” and in addition to the more familiar meaning “wind,” “风”also means “style.” Thanks to reality TV personality Kylie Jenner who wears this brand on many occasions, Brandy Melville has become popular in many countries, especially in the United States. With teen girls as its primary market, the brand produces clothes in two sizes — S and XS — for very slim girls, and its signature pieces are crop tops, skinny jeans, shorts and miniskirts. The colors and patterns adopted are often light shades like pale blue, white, light gray or checked. To sum up, the term “BM-style” describes a clothing style popular among teen girls and young women that features simple but figure-flattering pieces in small sizes.

Example:

A:听说现在流行BM风。什么样的衣服算这种风格呢？

Tīngshuō xiànzài liúxíng BM fēng。Shénmeyàng de yīfú suàn zhèzhǒng fēnggé ne?

It’s said that the Brandy Melville-style is a hot clothing trend now. What kind of garments fit that definition?

B:比如紧身白T恤搭配格子超短裙。

Bǐrú jǐnshēn bái Txù dāpèi gézi chāoduǎnqún。

A skinny white T-shirt with a checked miniskirt would do.