The youth's slang is so hard to keep up with...

I remember having a defective hdd in my PC. I brought the pc to the shop, where I bought it from to get it replaced under warranty. They told me they couldn't restore my data (I had backups) and asked if I wanted them to install windows on it. When they asked for my key I was like "FC..." and they responded "ok, we know that one, no need to spell it out" and proceeded with the installation