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The Americans and Canadians referred to Germans, especially German soldiers as "Heinies", from the pet form of the common German male proper name Heinrich.

In the film 1941 the Slim Pickens character calls a German Officer "Mr. Hynee Kraut!"

Heini is actually a common German slang word with a slight derogatory meaning similar to moron or idiot, but it could be of different origin.
by Bougon April 15, 2010
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A pompous word describing the tush of any animal. It it used to declare someone stupid, or unwittingly dumb.
Stop messing around with your pencil. You're being such a heinie.
by Made Een March 09, 2010
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