All it does is just display a printer-friendly version of the topic (white page with black text) which you could then print out on your printer.
But yeah, I have seen cases where someone prints something in an incorrect way or with the wrong printer driver that causes the printer to keep printing gibberish until someone stops it or it runs out of paper.
You know, I've never clicked on the topic "Print" before.
I suspect it was some unknown search bot doing it. If there's a link they'll try to "click" on it to see where it goes. I have a calendar on another site and Google has "clicked" all the way back to 1752 one month at a time LOL.