"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.
Ah man, after sitting on that terrible wooden chair all day, this sofa is like taking off skates.