
From such an established club as FC Barcelona you would expect the nickname of their supporters and fans to be of deep rooted, meaningful, historical/political and/or cultural significance and origin.
The Barca fans are as globally renowned for their passion for their club as they are defensive of their Catalonian identity, but FC Barcelona supporters' nickname derives from the Catalan word “cul” which means simply “ass”.
So, “Els Culés” are nothing else than “The Arses”. The reason is simple and goes back to the early 20th century and the old Barca stadium “Les Corts”.
Passers-by could see the rears of fans sitting in the upper stand. Therefore quickly a new name for the supporters had been found. It seems that the name “Culés” has attached itself to the famous institution of FC Barcelona forever.