Johnny jump up

n.

Cider stored in whiskey barrels. The contamination from the recently used barrels would strengthen the potency of the cider no end.

In use

I had a magnum of Johnny Jump Up boy and it blew me head clean off...

Let Lawrence Muck translate it to posh English for you
Lawrence Muck

Well, if it isn't my dearest reader. Would you like me to translate 'Johnny jump up' in use for you?

I consumed a magnum of whiskey barrel cider, old boy, and it blew my head clean off.