You rent anime/manga out to your less-knowledgeable friends.
You spent MONTHS making cosplay costumes and a large amount of your income.
I'm actually guilty of a lot of the things listed here....
Okay:
...you have the kanji for "Shinigami" tatoo'd on your back, in brush strokes, and it takes up more than 6 inches long and two inches of width. (mine is 7x3
)
...your nickname (given to you by non-otaku friends) is based on your most cosplayed/favorite anime character.
...your nickname given to you by otaku friends is god/goddess of anime, based on your uncanny ability to solve anime-related arguments without inputting much effort.
...you have memorized most of Yu Yu Hakusho.
...you know/knew by heart the lyrics of all of the songs, both Japanese and English, that were ever in any episode of Sailor Moon.
...your nickname is Ani-chan (Anime girl), and people who don't speak Japanese, and do not know what anime is call you this.
...your
Manga collection could pay for your college tuition.
...you have ever written an anime based fanfic.
...you spend most of your free time
reading anime based fanfic.
...you spend more than 100 hours working on any cosplay costume.