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.
B: Blunderful!
B: Blunderful!
by InvisibleConnections October 29, 2006

by The Real Mr. Turbo July 16, 2015

Broady - I'm gonna blunder that bird with massive tits I tell you.
Robbo - Yeah, I got blundered the other night by 6 blokes, it was great.
Broady - Get away from me.
Robbo - Yeah, I got blundered the other night by 6 blokes, it was great.
Broady - Get away from me.
by David J Wild June 25, 2008

by Mhia April 5, 2007
