The term 'Pixar Clown Fish' refers to the character Nemo from the 2003 Pixar animated film 'Finding Nemo'. Nemo is a young clown fish who embarks on a journey to find his father, Marlin. Along the way, he meets a variety of sea creatures and learns important lessons about friendship and family. The film was a critical and commercial success, earning an Academy Award for Best Animated Feature.