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.
an MMA attack in which you jump into the air and grab the opponent by the head with all four of your limbs similar to a prize claw machi..