Watching porn in anticipation of a sexual encounter in order to increase satisfaction and maximize desire.
I knew my girl would be coming over later so I treated myself to some fappetizers.
Those fappetizers had me so worked up that when I pulled out during sex I came on her face from down town NBA Jam style.
Fap meets appetizer. When fapping (masturbating), a fappetizer is something, usually porn, that you fap over a little to get in the mood and build up your appetite for the main course, which will be whatever you finally ejaculate to. Word coined by Little Lord WTF? (WTFSexFacts)
Little Lord WTF?: "I fapped off to it a little. It was a fappetizer. The porn film I watched afterwards was the main course that satisfied my hunger."