So. The whistle guy is a thing in NO. From Twitter (I don’t know how to paste a Twitter thing here)
Mike Tirico:
“Those asking about the whistles from the crowd on saints/rams game. The Saints have a super fan nicknamed “whistle man” .. no joke .. have met him many times, great guy. He wears a whistle costume to games. He has the loudest, most piercing natural whistle I have ever heard.”