Where as a demonstration against something men and women occupy a room in a building and have an orgy that is public sex that only stops when there demands are met. They often chain themselves to something to make it hard for the police ect. to drag them off.
Did you hear about that fuck in they had at our school to day?
To boot or smash in/up, can also be used to describe what you are going to do to someone.
Aye, fuck in his windaes, he's a dobber!
Ah'm gonnae fuck in your face ya fanny!