Wonder Blunder

Best definition
Wonder Blunder
a feeling of surprise mingled with admiration, caused by something beautiful, unexpected, unfamiliar, or inexplicable by way of a stupid

or careless mistake.

I was amazed at how it worked out to his advantage even though he screwed up big time. It was a real wonder blunder
Wonder Blunder: define #2
A mistake of or relating to wonder bread.
“What the… did you get white instead of wheat!”

-“Oops. What a wonderblunder.”