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It obviously makes me think of the third wave of feminism but that was only in the 90s. Just like the third wave of ska.

Edit: shadowbanned top-level comment says it's a surfing term. https://www.surfertoday.com/surfing/why-should-we-never-take... maybe?

I think the implication is that he completely made it up.

I think this is a common superstition among surfers waiting for a set to roll in