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1) A Waifu Killer is someone who cosplays your favorite character preferable female anime character and you don't like the person for cosplaying the character you like.

2) Someone you dislikes who cosplays a favorite character of yours and you really don't want to see them as said character.
1) Man, why did Antonio cosplay Hestia, what a waifu killer!

2) She had to cosplay three of my favorite characters, damn waifu killer!
by Julia Lenna February 09, 2016
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Jul 23 Word of the Day
A tourist to sub-orbital or orbital space, through commercial space flight programs.
Jeff Bezos and Richard Branson alongside their crew became the first astrotourists, while visiting sub-orbital space in July 2021
by AxonL July 20, 2021
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