-ista
combining form
indicating a supporter or follower of someone or something
⇒ 
fashionista
⇒ 
Portillista
Origin
C20: back formation from Sandinista-ista
                suffix
     -          informal forming nouns denoting a person associated with a particular activity, often with a derogatory force〈非正式〉构成名词, 表示从事特定活动的人(常带贬义):
-       fashionista. 
词源
from the Spanish ending -ista, as in SANDINISTA .
ORIGIN: from the Spanish ending -ista , as in Sandinista 
-ista
Suffix
- Added to words to form nouns denoting one who follows a principle; an adept. - fashionista
- Marxista
- Lincolnista
 
Etymology
From Latin -ista via Spanish -ista in "Sandinista" (1930s).
Usage notes
Words formed using this suffix usually have more of a pejorative connotation than related words formed using -ist.
Derived terms
 English words suffixed with -ista