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.
To make homosexual overtones purely for entertainment purposes.
"Did you see Alice and Jane Kissing! I had no idea they were lesbi..