To send a fax, generally many pages in length, of a solid black image. The intent is that the recipient's fax machine will run out of ink or toner, or possibly even break.
I just got fired because the budget wasn't big enough for my salary and the new soda machine. I'm totally going to black fax them all day.
by Jonba February 02, 2008

5 Words Related to black fax

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