Etymology

girl math

Today it means: Logically and mathematically dubious reasoning said to be used by women to justify expensive purchases, which inevitably concludes that the purchase in question is "basically free" or even makes a profit. Full definition →

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The story

Coined by the New Zealand radio show Fletch, Vaughan & Hayley, whose segment "Girl Math" went viral on TikTok in August 2023. The segment features a caller who has made a large purchase, and the producers work together to use girl math to "prove" that the caller has actually made a bargain.

Etymology from Wiktionary, CC BY-SA 4.0.