The keyword phrase functions as a compound proper noun. It is not a grammatical sentence but a specific identifier used as a topic label, similar to a title or a search query. It designates a singular, identifiable news event by combining a date ("11 Sep") and a subject category ("Florida Man").
In this context, the components serve distinct functions. "11 Sep" acts as an adjectival modifier, specifying the date and context of the event, linking it to the anniversary of the September 11th attacks. The term "Florida Man" is a noun phrase, referencing the well-known internet meme and news trope for unusual incidents involving men from Florida. The combination pinpoints a specific case: the 2015 arrest of Joshua Ryne Goldberg of Orange Park, Florida, who was charged by the FBI with distributing information relating to explosives and weapons of mass destruction. He had posed online as an extremist and encouraged an undercover agent to carry out a bombing at a 9/11 memorial event in Kansas City, Missouri.
For the purpose of an article, treating this phrase as a proper noun establishes the main point as a specific case study. The article's focus is therefore not on the "Florida Man" phenomenon in general, nor a broad topic about September 11th, but on the precise intersection of these concepts as embodied by the Joshua Goldberg case. This allows for an analysis of a unique event involving online radicalization, domestic terrorism, and the cultural iconography of a specific news trope.
