Combining clothing items that according to style etiquette do not go together. Doing this as a powerful figure will result in people unquestionably approving your fashion sense, and taking you in higher esteem.
An awesome person with colorful clothes and an awesome personality. Clashionistas often are amazingly intelligent and kind of hippy-like, but not always.
Person 1: Wow, that girl Fiona is definitely a Clashionista!
Person 2: Yeah, and kinda hot too!
Person 1: Definition of a Clashionista!