fet ‧ ish /ˈfetɪʃ/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Language: French ; Origin: fétiche , from Portuguese feitiço 'artificial, false' ]
1 . a desire for sex that comes from seeing a particular type of object or doing a particular activity, especially when the object or activity is considered unusual:
a leather fetish
2 . something you are always thinking about or spending too much time doing ⇨ obsession
fetish for/about
Sue has a real fetish about keeping everything tidy.