"Fins up" has several related meanings depending on the context:

• In Jimmy Buffett's fan culture, "Fins up" is a call for audience participation during his song "Fins," where fans raise their hands above their heads in a fin shape to mimic shark fins. It symbolizes being part of the Parrothead community and enjoying the music together. It also references sharks' dorsal fins, which keep them upright and symbolize being alert and happy. This gesture evolved into a kind of "secret handshake" among fans and a sign of good vibes at concerts

• In sports, particularly at Ole Miss, "Fins Up" is a gesture started by Tony Fein, a former marine and football player, as a symbol of pride and toughness for the defense, likening them to "landsharks." It became a tribute to Fein and a rallying sign for the team and fans

• For the Miami Dolphins football team and fans, "Fins Up" is connected to Jimmy Buffett's song "Fins" and has been embraced as a slogan and celebratory gesture. It is used to show support for the team and is featured in fan chants and merchandise. The phrase gained popularity when Buffett got involved with the Dolphins, and it is associated with the shark imagery of the team

• More generally, "fins up" can mean being "on the prowl" or actively pursuing a goal, often in a social or romantic context

In summary, "Fins up" is primarily a symbolic gesture representing shark fins raised, used to express unity, pride, alertness, or readiness, especially in Jimmy Buffett's fan culture and certain sports communities.