Su La, written as 俗辣, comes from Taiwanese Hokkien slang used in everyday speech in Taiwan to mock someone as cowardly or too scared to act. The written characters are also read in Mandarin, but the sting of the phrase is tied to its slang use as a taunt between friends. Online, the short spoken form travelled easily through chat replies, livestream reactions and short meme clips, because it needs no setup or explanation. It stays popular as a compact, funny insult that can be dropped onto almost any timid moment.