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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.
Good morning heinie!
Heinie by Bougon April 16, 2010
Butt. Backside. Rear end. Tochas. Keister.
Larry spent the evening ogling Joanne's heinie.
heinie by The Wog Whomper May 14, 2005
Don't touch my heinie!
heinie by frank carter June 18, 2006
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.
Heinie by Made Een March 9, 2010

Heinie Flu 

Another name for Swine Flu. The word is derived from the fact that this particular strain of flu is the H1N1 strain, which can be read hini, or "Heinie."

Elements in the Federal Government do not want the illness identified as Swine Flu, so this is put forward as a substitute.
That guy in the aisle seat is hacking away: I hope it isn't the Heinie Flu.

I've got a hangover, but I'm going to tell HR I might have Heinie Flu 'cause I could use a few days off.
Heinie Flu by Twinzilla April 29, 2009