"Aziraphale" - some character from some fandom (books, later got a movie, show? something). The character is fat, according to google. "Genderbend" - online practice to write/draw a certain character/person with inverted gender. So in case of Aziraphale, it would be writing about/drawing Aziraphale as a female. "Ineffable" - no fucking clue. A definition by urban dictionary is: "Can not or, will not be expressed in words." Apparently it is related to people considering Aziraphale and some other character in relationship (possibly this is only fan fiction and not a real thing in the books). "Genderbend/Ineffable wives art" - art of the said two characters being portrayed as women (instead of men as they originally are) and in a lesbian relationship.  To sum up: This lardbrain is saying that if anyone portrays this fictional character from the books (Aziraphale) as a skinny woman instead of fat man (as he originally is), while drawing art of that character and another character in a relationship, the OP butterhuffer will fight that "artist".  Conclusion: tumblr OP is a retard. Hope the explanation helped.