Differ out 

word used by knacker boy racers as a term for lookin like a muppet in there cars

here mitch feen differ out...... aw no feen me tyres are bare

Differ out by dean reeves July 7, 2008

diffed out 

Missed out on an opportunity to obtain, do or see something that is good and you wouldn't want to miss.
Earliest known usage 1978?

You completely diffed out on a great party.

diffed out by Howard Gillespie October 9, 2006