Scottish slang originated in Ayrshire.
Short for "superb" or more accurately "soooperb" (has to be said with an accent)
Variations can include perbola, perbingo, perbalicious, perbation, perbatronic, perborama etc.
"I was at a gig last night, it was sheer perb."
"I just wasted 2 hours of my life watching a shite film, this is not perb."