The dangerous book in question last night was my much loved copy of "Depraved English", a selective dictionary compiled by Peter Novobatzky and Ammon Shea. Should you decide to buy your own copy, in a new updated edition (and I recommend that you do) - you can find it here.
Whilst doing the idle flipping I was delighted to discover the verb "to feague". To feague is to insert something up a horse's backside in order to make it look perkier, livelier - more saleable.
Feague is also a noun; the actual item that is pushed up where the sun don't shine. I quote from the book..."a good feague could consist...of several things, the most common being raw ginger...(or if stronger measures were called for, as in the case of a particularly sluggish or decrepit nag) owners sometimes resorted to the insertion of a live eel."
I don't know if I'm happier that a word exists for such a thing or that I'm not a horse in need of pepping up.