... Then Reicher told me a story about the only time he ever went to a tennis match. “It was a ‘people’s day’ at Wimbledon, and the hoi polloi were allowed into the show courts. So we were on the number-one court. Three sides were ordinary folk, on the fourth were the members. The game we were watching was fairly boring. So people in the crowd started a Mexican wave.(/ˌhɔɪ pəˈlɔɪ/)
1. The common people; the masses.
From the post: Vocabulary Words from 'So You've Been Publicly Shamed'
Source: So You've Been Publicly Shamed, by Jon Ronson (amazon.com)