What Is This ‘Bird Theory’ Trend Going Viral on TikTok?

The "Bird Theory" Trend on TikTok

A new trend is taking over TikTok, with thousands of users participating in the "Bird Theory" challenge. The trend involves telling your partner you saw a bird and recording their reaction.

The purpose of this trend is not about birds, but rather about testing relationships using a method known as the "Bid Test".

The viral TikTok trend is all about testing your relationship by using a scientific method known as the "Bid Test" to gauge your partner’s engagement.

Couples are flocking to TikTok to share their experiences with the "Bird Theory" trend, which has become a popular way to assess their partner's engagement and reaction.

Author's summary: Testing relationships on TikTok.

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Mental Floss Mental Floss — 2025-10-29