Abbreviation of フェティッシュ. Refers to a sexual fetish or an object of obsessive desire.
彼は足フェチらしい。
He seems to have a foot fetish.
Casual, often used in compounds like メガネフェチ to mean a strong liking or obsession, not necessarily sexual.
彼女はメガネフェチで、いろんなフレームを集めている。
She has a thing for glasses and collects various frames.
She has a shoe fetish.
フェティシズム names the general concept or practice of fetishism, whereas フェチ refers colloquially to a specific fetish or obsession a person has.
フェチ is a casual loanword for a specific fetish object or focus, while 性癖 more broadly covers one's whole sexual inclination.
ASMR video; sound-fetish content
Abbreviation of フェティッシュ, from English 'fetish'.