An impressively obscure and scholarly-sounding word, which might earn high points in a game of Scrabble, but is inappropriate in almost any natural discussion. Typical in Internet comment sections, typed by someone with an English or Liberal Arts degree, or no degree at all.
"Well TonystarkMCU94, 'jejune' and 'profligacy' are some nice scrabble words, but nothing in you post mentions anything relevant to the topic about branches of government or the ongoing budget crisis. Try reading a book, not a thesaurus"