I get you, but I believe your usage is a neologism as well. Verbatim:>a form of sexual desire in which gratification is linked to an abnormal degree to a particular object, item of clothing, part of the body, etc.
It was used for fapping and cumming to shoes alone, the feet alone no matter whose they are, and so on. It was meant for actual abnormal, non-natural behaviour. I've even read a good manga that explored this in proper, which is rare.
Your usage comes down to pretty much "things that arouse you [greatly]", even if they are normal, coventionally sexual acts like kissing. Your example about having a boner in public can happen to say, a man staring at a hot schoolgirl or office lady, and that's not them having a fetish but not being able to properly control their lust for the occasion. Even a real fetishist should be able to keep to himself.>>182684238
This, they have trouble or it becomes impossible getting aroused from other, normal behaviour, which often means they can't maintain a relationship.