There is no mainstream "deep content" for this specific phrase; it is likely an inside joke, localized slang, or a technical status message from a specific internet sub-community. Fu10 The Galician Night Crawling Updated
Below is a based on the most logical interpretation: FU10 as a small European (likely Spanish/Galician) independent label that released a 45 RPM single by a band called "The Galician Gotta" (or a phonetic equivalent). fu10 the galician gotta 45 fixed
However, for the digital archaeologist: