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To say a word or phrase at the exact same time as another person. Was, in the Dark Ages, identified with a "Jinx! You owe me a Coke!
(watching the the Crocodile hunter)

Lea/Ale: Look, crazy guy!
(bewildered stare)
Lea/Ale: Stop it.
(frightened stare)
Lea/Ale: AHHHHH

(later)
Ale: What a fine example of synchro-speech.
by i_can_haz_nipz_pierced?! February 04, 2009
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