Girl Math

Girl math is an internet-popularized term for the informal, often humorous rationalizations young women use to justify individual purchases or spending decisions, a way of talking about personal financial reasoning that spread rapidly through social media rather than a formal academic concept. The phrase originated on the New Zealand radio show Fletch, Vaughan and Hailey in mid-2023, but reached wide popularity after a TikTok video posted on August 2, 2023 framed it as a successor to the earlier girl dinner trend, and the video's millions of views drove rapid adoption across other platforms. Commentators have connected the pattern of reasoning it describes to established behavioral-economics ideas such as mental accounting and the framing effect, while critics have argued the meme risks reinforcing stereotypes that portray women's reasoning as illogical or emotional, with possible effects on how girls see their own mathematical confidence.