Thus, probably means "Manager Hot." But what does that imply?

(Humanitarian OpenStreetMap Team) that uses a tool called the Tasking Manager The Mission:

If you delete the 'j' and swap the 'n' and 's', you get Mason Jar. "Mason Jar Hot" is a legitimate search query.

If you were referring to a specific meme, a local slang term, or a different "masnjr," could you provide a bit more context?