What is That'll Be The Day...?
1.
An expression meaning "That'll never happen". Shortened from "That'll be the day when (insert ubsurd impossible occurence here, such as 'Pigs will fly')"
Bob: I'm gonna kick your butt!
Joe: Haha, yeah, that'll be the day....
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1.
Quoted from Milton Waddams in Office Space.
Now seen (and parodied heavily) by the site that gave you You're The Man Now Dog
I be..