The who dat chant is best known from New Orleans Saints fandom, where fans use the full call-and-response line to rally behind the team and tease opponents. Shortened to just who dat who dat, the phrase moved beyond stadiums into group chats, fan edits and meme soundboards as a portable hype cue. Its stadium roots explain the crowd-like delivery and defiant tone, while its simple repetition made it easy to clip, loop and reuse whenever someone wants instant confidence without needing any extra context or explanation.