Ram - a male sheep
Patriot - one who loves and supports his or her country
Okay, these aren't necessarily regionalisms specific to either Boston or LA, but they're important nonetheless. The names of sporting teams tend to be built on a combination of crowd appeal and a hope that nominative determinism is a real thing. Both of the teams in the 2019 Super Bowl have names which carry positive connotations: rams are forceful, strong animals, and patriots are, well, patriotic. Yet each of these words has senses, or variations, which are somewhat pejorative.
Patriot came into English in the second half of the 16th century. In early use it tended to be found with some sort of modifier (such as good); patriot rarely stood alone until later in the 17th century. Beginning in the middle of the 17th century, the word also was often used in derogatory fashion, referring to hypocrites who professed love of country.
Courtier or Patriot by turns,
The Hypocrite our Patience tries;
Disgrac'd, our Grievances he mourns,
Or laughs in place at Jealousies.
— Anon., Aesop return’d from Tunbridge, 1698
Ram has been around longer than patriot; it dates back in use to before the 12th century. Should one wish to use the adjectival form of this noun, it is rammish. However, in addition to meaning “resembling a ram,” rammish also means “rank in smell or taste.”
What shall I tell you of that other fish, which the Abbot would not meddle with, because it was so rammish, and stancke so vilely?
— Mateo Alemán, The Rogue, 1623