A very polite and respectful way to end and/or convey your feelings to the another human being that you are having a conversation with.
Little Girl: Excuse me sir, can you help me I can't find my mommy :(
Man: Fuck off.
When you have a group of people, men and women, that are open to having sex with each other.
Are you horny Gril? No we had a fuck off this morning.
I love you dearly now go away before I make you :)
Fuck off fuck face
When a teacher tells you to go line up after recess, you say fuck off
Teacher:Go line up
Student 1:Fuck off boomer