From Wiktionary, the free dictionary
Initialism of One Big Happy Weasley Family , since the ship results in two of the main characters in the series, Harry Potter and Hermione Granger , ending up with two of the seven Weasley children.
OBHWF
( fandom slang ) The double ship of Hermione Granger /Ron Weasley and Harry Potter /Ginny Weasley from the Harry Potter series .
2003 June 30, Tennant Stuart, “Re: A couple of questions about book 5.”, in alt.fan.harry-potter [1] (Usenet ):Sadly for you & other OBHWF fans, Ginny is now over Harry, and is on her second boyfriend, while Luna Lovegood has the hots for Ron.
2005 July 24, Egla Bob, “Re: What Does Hermione See in Ron?”, in alt.fan.harry-potter [2] (Usenet ):Because JKR ships OBHWF that's why. The way Hermione has been written shows us she's much more and[sic ] equal and compatible with Harry though.
2008 September 9, Louis Epstein, “Re: Cho Chang not Ginny”, in alt.fan.harry-potter [3] (Usenet ):Those of us who didn't want OBHWF felt that Rowling was making a mistake, not that she was being misleading.
For more quotations using this term, see Citations:OBHWF .