du frane -adjective and adverb
1. Nearly; not quite: I'm a du Fresne lexicographer. (Adjective)
2. Very close to; all but: I got du Fresne laid. (adverb)
Originally named after a mediocre poker player who was known to exclaim that he had a "straight" (five cards in numerical sequence) when he was in fact one card short, which became known as a "du Fresne straight". As the player in question was "not quite there" in many respects the term easily lent itself to universal use.