Mum - "Proper trainers'll cost £15! You'll make do with gutties"
Derives from the word 'gutless'
Brian: That's gutty
Pat: And to top it all of, he ended up taking her back to our place!
Brian: King gutty!
Note: Usually used to describe a great play in sports.
Desh: HOLY SHIT!! Did you see what he just did?
Bryan: Yep, Mike Richards is gutty as hell.