Back to back homerun.
Interesting, Taka. It's mid-19th century, so possibly expanded from the poker-playing meaning: two cards of the same denomination dealt consecutively , the first face down and the second face up (this is the way of dealing both blackjack and the beginning of 5-card stud). Hence the cards appear to be back-to-back .
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And homeruns don't have any backs or faces.
C'mon, Taka-- stop trying to use logic!
I've got your back