Derived from World War 1, when Germany tried to attack France from behind but still lost.
The modern derivative means 'To go in from behind, and still end up getting fucked'.
"I tried to give her anal, but she pulled a Schlieffen Plan on me. Now I can't walk straight."
The true way to endearingly address your friends/family/subjects/pet. Anyone who is cultured enough to use this phrase deserves all that the world has to offer.
"What's up my gang bang orangutan's?" - Me
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A Jia Khai is a common term to describe someone with enormous man-boobs, a small sex organ, but most importantly, the big gay. The 'Jia Khai' is also a commonly used derogatory term occasionally used in gaming. It is especially popular in the Overwatch community.
Woah, slow down there, Jia Khai. Get your voluptuous breasts out of my face.