Mine is this and Leela’s “oh lord.” I mean, there are so many, but those two top the charts.
Hard to say which is used more by my wife and I between:
“Huh, learn something dumb every day!”
“Shut up baby, I know it!”
That sound Amy makes when she doesn’t answer yes or no and just goes “Guuhh!”
“Eww, look at him go! He don’t care!”