noun: term for the fellatio performed by a person who sees the action as enjoyable and pleasant, as opposed to an obligation or duty. Instead of being viewed as a task to endure just to get it over with, a blow hobby is relished and anticipated by the person giving it.
Girl #1: My boyfriend always asks me for blow jobs. I do it, but I sure don't like it.
Girl #2: Are you kidding? I love going down on my boyfriend! I enjoy just as much as he does. It's not a blow job, it's a blow hobby!