"long finger (plural long fingers)
middle finger
(idiomatic, Ireland) A state of postponement or procrastination.
(idiomatic, Ireland) hire purchase or credit.
Jim tries to look flash but he buys everything on the long finger."
( http://en.wiktionary.org/wiki/long_finger )
Scheint wohl im irischen Englisch gebräuchlich zu sein.

"Recently at a family lunch here in Australia I mentioned I was going to put something on the long finger. There was silence for a moment and then my son asked: “What does that mean?” I have been almost forty years in Australia and still use Irish English phrases and words not knowing that they are not understood by all. Of course it didn’t help when I explained that to put something on an mhéar fhada in Irish means to postpone something and that the long finger is the middle finger!"
( http://www.macmillandictionaryblog.com/irish-... )

Thank you. Yes, the whole article is about Irish companies, so that makes perfect sense.