blitz

German: A flash of lightning. Used to illustrate extremely high speed.

"The führer gave orders to start a blitzkrieg." (krieg=war)

keks

German for any tea biscuit or cookie. Though "Keks" was originally intended to be a plural form of "Kek", it has become a singular form (proper plural is now "Kekse").
Invented by biscuit-manufacturer Bahlsen when he first introduced his Leibnitz biscuits around 1900. When people couldn't pronounce the english word "cakes", Bahlsen made up "Keks".

Cookie Monster: "KEKSE! KEKSE!"

kek

German. Singular form of "Keks" - not used or even known of by most speakers.

Potzblitz, ein feiner Leibnitz-Kek!

schnuck

German. An expression without any meaning which is included in everyday conversations to see how the other person reacts. First used in the "titanic" magazine and adapted by readers.

Ja, stimmt - aber auch schnuck, oder?
(Yes, right - but also schnuck, isn't it?)

Untermensch

Translates into "subhuman"

Das judeobolschewistische Untermenschentum steht vor der Tür und bittet um Einlass, mein Führer. Was darf ich ausrichten?

sandwich

2 men penetrating a woman from both sides at the same time, vaginally and anally.

Peter and John sandwiched Mary.

Panzer

1. German. Any heavily armoured military vehicle, or armour in general.

2. A very overweight person

1. Don't drink and drive your panzer, Fritz.

2. God, look at that panzer!