Fuckyounism
A mental illness that makes a person say 'fuck you' to everyone and everything all the time.
Person1: what's up man.
Person2: fuck you!
Person1: dude, you have a serious case of fuckyounism. You should see a shrink.
Person2: fuck you!
Person1: dude, you have a serious case of fuckyounism. You should see a shrink.