What is the 'Boo' trend on TikTok? The cross-eyed prank everyone is pulling on their partners

If you have seen people pulling a cross-eyed face, saying “boooo” and leaning into the camera, you have seen the Boo trend, one of TikTok’s biggest jokes this October.

How it goes

There are two parts:

1. The face. You record yourself saying “boo” while crossing your eyes, making a silly face and moving towards the camera, copying the original viral video.
2. The prank. You convince someone else, usually a boyfriend, girlfriend, parent or sibling, to do it with you. Then you delete your own part and post only theirs. They look ridiculous on their own, and that’s the joke.

Where it started

According to Know Your Meme, as reported by Yahoo Entertainment, the earliest known example was posted on September 20, 2026 by TikTok user @v99191, with the caption “Booooo #boooo #relatable #funny #blowthisup”. It passed 8.4 million views and 1.1 million likes within a few weeks.

In October it turned into a prank format:

• October 2: @jayciebelcher3 pranked a boyfriend, passing 1 million views.
• October 3: @93930.r did the same, reaching 1.7 million views.
• October 6: @kkk4t33 posted a partner prank that got 2.6 million views and 641,300 likes in about a week.
• October 9: @nimrashamid pranked their dad, getting more than 735,000 views.
• October 12: @lily_d.88 tried it with a cousin and got 1.3 million views in about a day.

Fans have also shared edits of K-pop stars pulling similar faces.

Why people love it

It’s quick, it needs no skills or props, and it plays on trust in a harmless way. The best versions are the ones where the victim commits fully, with a big serious “boo” and fully crossed eyes, and only learns later that they were on their own in the final video.

It also travels well in Pakistan, where family pranks on parents and siblings are already a favourite. Just make sure the person is happy for you to post it.