One subculture known as “accelerationists” lives in constant expectation of a race war that will topple the federal government. The pandemic became the latest in a long line of possible igniters.

Some label their expected second civil war “the boogaloo,” and experts have tracked a spike in interest in the term on social media, plus a proliferation of advice on how to prepare.

The name is a pop culture reference derived from a 1984 movie flop that became a cult classic called “Breakin’ 2: Electric Boogaloo.” It went through various mutations and emerged sometimes as the “Big Igloo” or the “Big Luau.” That is why adherents sometimes wear Hawaiian shirts, say those who track them. Many such shirts were in evidence when armed protesters stormed the state capital in Lansing, Mich., Thursday and they have appeared in rallies across the country.