A word to be used when someone says
something you didn't quite hear or don't understand. This usage originated when a spelling bee
champion misspelled the word "scombridae" in a
news interview.
"Scomberdae? Are you saying scomberday?" can be used if you want a person to repeat him/her self or to
show that you don't understand.
Alternatively, "
Oh, well I thought you were saying scombrdae," can be used to
cover for a mistake made due to misunderstanding.