'Puddleglum,' they've said, 'you're altogether too full of bobance and bounce and high spirits.[...]'
--The Silver Chair, by C. S. Lewis, written around 1953; p, 76 of the 1994 HarperTrophy paperback edition
Don't recall ever seeing this word elsewhere, and it's not in MW3 (Unabridged!). But Webster's 1913 has it: bobance is defined as "a boasting." The Free Dictionary also lists bobance, with a quote for reference:
"We have had enough bobance and boasting," said Hordle John, rising and throwing off his doublet.
--Sir Arthur Conan Doyle, The White Company