The Brief: "Fax, no printer" is another phrase for "facts" which means "truth." It signifies being in agreement with another person.

DEEP DIVE
“Fax, no printer” is another way of saying “facts” which is typically used when an individual is in agreement with someone. “Fax, no printer” is not a new phrase.
As of recent, it grew in popularity on TikTok after a viral video featured creator @briaalanaa saying, “Hey yo! The person who sent you this wants you to know … fax, no printer. Copy, no translate.”
@briaalanaa SEND IT YOU WONT🤪❤️ #fyp #foryoupage
The phrase is now a running joke on the app with creators making their own renditions of the video.
@juliesofiaa fax no printer <3 @manny_delgado
@pimpinsimp69 GUYS PLEASE REPOST ALL THE VIDEOS YOU GUYS HAVE AND TAG MY NEW ACCOUNT #_samueladrian_
@justintimefordinnar I hope you guys know what video I’m talking about #fax #noprinter
Doja Cat even hopped on the trend.
@dojacat Gangs back together