Rosca izquierda is a Spanish slang term that refers to a person who is considered different, weird or out of the ordinary. It can be used in a pejorative or a friendly way, depending on the context.
Examples
- Spanish: Juan siempre ha sido una rosca izquierda, siempre tiene ideas muy originales.
- English: Juan has always been a 'rosca izquierda', he always has very original ideas.