トピ主ぬしトピぬしMeanings1nounoriginal poster; OPinternet slangInternet slang for the person who started a thread or topic on a forum or bulletin board. Similar to スレ主.See also: スレ主トピ主ぬしの質しつ問もんにみんなが答こたえた。Everyone answered the original poster's question.
