If you throw up Jack Daniels in a Spanish speaking country. In English you would Yack Jack, however Spanish people pronounce words starting with J as Y, hens Yack Yack.
(Dude throwing up Jack Daniels in Cancun when a local is around and sees)

Dudes Friend: Where did my buddy go?

Mexican Local: Oh, he Yack Yack Senior.
by Grieb Minzadian April 03, 2010

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