April fool

American  

noun

1. the victim of a practical joke or trick on April Fools' Day.

2. a practical joke or trick played on that day.

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April fool British  

noun

1. an unsuspecting victim of a practical joke or trick traditionally performed on the first of April ( April Fools' Day or All Fools' Day )

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Etymology

Origin of April fool

First recorded in 1680–90

Example Sentences

This was followed by two smiley faces and a later post saying "April fool ma brother ohh".

From BBC

The council's deputy town clerk, Clair Davis, believed it was an "April fool's prank published too late".

From BBC

In the comments section of Hart’s post, several followers said the clip “feels like a April fool’s joke they released early.”

From Los Angeles Times

Many thought it was an April fool’s joke because the letter was sent around that time.

From The Guardian

“Is this a psyop meant to distract the tech+justice world? Is it cringey tech April fool’s day already?”

From The Verge