You send another email right away.

Subject: Correction
Text: There was a typo in my last email: Instead of "overcome our testicles", I meant to write "cum over our testicles".
I apologize for the confusion.

You can't fix this. Instead you become an office legend known to everyone.

Enjoy your fame. It will help you. No joke, I mean it.

" sorry, I bollocksed that last email."

then send the correct message.

Tell them it was a phishing test, and they all passed.

I once sent a heavily pregnant female client an email that said “Seed you soon!”

She was kind enough not to mention it.

Sorry, autocorrect.

Send the same email. And maybe once more. Then have a colleagues reply to it. You reply back. And then possibly people will just assume there was some discussion for the same topic and might just not read it all. Only works if the original email was long.