Top definition
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.
by Howard Gillespie October 09, 2006
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug