An ethical moral value system which simply states: "mentally fuck with anyone as much as you can".
Fuckmentalism is best described by a few examples. What follows are two sample conversation between a fuckmentalist and a normal person:
Normal: "you know, you ask too many questions."
Fuckmentalist: "yes, this is true. But I ask a lot of answers too."
Normal: "You can either be gay... or bi"
Fuckmentalist: ".. or both."