The story
Clipping of devolution maximum. First attested in 2009http://books.google.co.uk/books?id=Qa9DAQAAIAAJ&q=%22devo+max%22&dq=%22devo+max%22&hl=es&sa=X&ei=xoQRVJbvE4T07Ab604G4Bg&ved=0CEQQ6AEwBTge.
Etymology from Wiktionary, CC BY-SA 4.0.
devo max
Today it means: Full fiscal autonomy for Scotland. Full definition →