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4.
a waifu is a mexican living in england who likes animated films and abhors all things cute (puppies, kittens, etc)
That waifu was bitchy all day long.
by SomeGirlFromKansas July 11, 2013
 
1.
A term coined by Otaku and Weeaboo alike for their 2D significant others; predominantly anime and video game characters. A Waifu, in contrast to a harem, is the love between one man and his one and only Waifu. You treat your Waifu with the utmost respect and courtesy and most refuse to even fap to their beloved, seeing the act as an insult to the non-existent woman they have committed themselves to.

A spin-off term "Husbando" followed for Fujioshi who feel similarly towards male characters.
Not even a missing dimension will keep you from your glorious waifu - The Melbourne MX Newspaper
by Chenoan March 25, 2011
 
2.
Weeaboo for "wife". Don't say this word ever, please.
Mai waifu ^___^

^ Faggotry.
by Connor Kelley June 17, 2008
 
3.
Japanese for "wife". Outside of Japan, it is seldom used by anyone but weeaboos to display their unhealthy attraction for fictional anime characters. See: faggot.
SAKURA IS MY WAIFU ^__^ ***OMG SO KAWAII DESU**^^*:3***
by Siriusd July 08, 2010