The action of cumming in someone’s hair, then sticking them to the roof.
Man, I hit her with that goop roof last night. She’s still up there.
A "new roof" is a local Northern Irish term used by males to describe their new haircut, their roof being their head.
Conor: "Hey lads, look at my new roof!"
Tom: "Did you really just say "new roof" ? That's embarrassing
(squeaking) Daniel im hacking im on the roof of nuke town!!!
(squeaking) im on the roof of nuke town!
Slang for both fuck off and mind your own business