adj ~ a wonderful occurrence that is purely a lucky coincidence facilitated or created by a blunder; succeeding because of failure, rather than despite it
Sweetheart, you're the most blunderful thing to ever happen in your mother's and my lives.
by D'Royce O'Coinpurse February 28, 2010
Port-manteau of blunder and wonderful; a particularly egregious mistake, possibly of epic proportions. Usually the speaker is deeply affected by the fallout.
A: Oh, so I was just playing with your computer and, errr, I had to reinstall everything because I deleted your whole disk.
by InvisibleConnections October 29, 2006