"Psst! I hear Jason the rugby captain has a boyfriend. I'd never have guessed he was a slate off the roof!"
"Am I heck as like wearing that flowery- concoction- thinly disguised- as -aftershave on my night out with the boys. Do you want them to think I'm a slate off the roof??"
Adjective used to describe a pleasurable feeling such as that which comes when hot, inflexible, jabbing skates (roller or ice) are removed after being worn for such a long time that you forget how uncomfortable they really are. Can also be used to describe something that just feels good, absent the removal of pain.