Terminology for wife/spouse attached to you in a real, legally binding sense, as opposed to anime or manga women you see in Japanese cartoons who aren't real and never will be, however you wish they were. This is why you have a waifu-in-real-laifu, because even otaku need to get laid.
Keiko's his Waifu In Real Laifu, seriously, he's a lucky bum.
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