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.
A mispronounced version of dialated usually said while intoxicated
"Man,are my pupels doopilated"..