What is Ja Ja?
1.
In German the word Ja (Yes) used twice in succession means "Kiss My Ass"
American Customer: Hurry up with that beer
German Bartender: Ja Ja
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2.
The German form of
Lieutenant Stormtrooper: Hero's in the base. Destroy him.
Stormtrooper: Ja ja. (Snaps his boots)
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3.
A Typo for "Ha ha" or spanish for "ha ha"
"Omg, u r soo funny, ja ja"
"NO HABLO ESPENOL? JA JA!"