So if someone typed (with the typo), they probably mean: "Find unblocked games hosted on GitHub (where filters don’t block the domain)." If you're asking me to analyze why that phrase is interesting — it's interesting because it reveals a workaround culture: students using developer platforms to bypass restrictions. And the typo ("guthub") is common enough that search engines still correct it.
That is an interesting piece of phrasing — looks like a small typo or mashup of two very common search terms: and "GitHub." unblocked games guthub