Rickroll
An apparently relevant link leads to a familiar music video.
Girl Math
A knowingly absurd calculation that makes a purchase sound easier to justify.
Classic formatSource guide
Example preview from the linked source ↗. This is a still image; open the source to view its context.
This guide links to third-party examples. It does not include a downloadable copy or grant permission to reuse the original media.
What does this meme mean?
Present a price, add a ridiculous mental-accounting rule, and reveal the resulting conclusion. The humor comes from your own flawed reasoning; the format also works for time, chores and hobbies.
Where it comes from
Girl Math purchase jokes spread on TikTok in summer 2023. Know Your Meme documents an August 2 video by @samjamessssss, followed by Girl Math and Boy Math variations on TikTok and X.
Sources reviewed 2026-10-03. Classic classification describes its history, not current platform popularity.
Make your own version
- Show an everyday purchase or task with its actual starting cost or time.
- Reveal one intentionally silly equation at a time instead of filling the screen with numbers.
- End with an overconfident conclusion and leave a beat for viewers to spot the faulty logic.
Original caption starter
If I wear it every day, each outfit costs approximately a rounding error.
Written for this guide. Add your own footage, artwork or appropriately licensed audio.
73/300 characters · edited on your device
Sources & examples
- Know Your Meme: Boy Math and Girl Math ↗Reference
- Samjamess: cited Girl Math TikTok example ↗Example · may be a later adaptation
