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To test something and make sure it's working. An anacronym commonly used in the television industry that stands for "Facilities Check". In larger broadcasts, it can sometimes take quite a while to find and fix a problem as miles of cables are sometimes run. Don't ask why they use an "X" instead of a "C" because nobody knows.
Did you FAX out the audio yet? Yes, audio is fully FAXed and ready to go.
FAX by The Sarcastic Engineer September 1, 2022
Related Words
fax means correct and or your really flipping smart. Also used when you dont know what else to say.
this pizza is so good
FAX boi ur so right
Fax is forever love between 2 people. Their relationship will be forever fax.
Freddy and Dax together make Fax
fax by THICC PANDA #1 May 22, 2023
Shortening of "fanum tax," another slang term which refers to the practice of taking food from one's friends.
Fax by Billy Cricket July 3, 2024

fax bomb 

A type of punking in which one faxes another person or entity an all-black piece of paper with the intention of purposefully depleting their fax toner cartridge.
"I have to buy toner because Jake fax bombed me after I stole his donut."
fax bomb by Hydrocodon't March 16, 2010

Fax, no printer 

When u are speaking pure facts
Damian: stop lying to me

Me: you are daddy and that’s fax, no printer
Fax, no printer by Luluisa October 26, 2019