If you are a girl between 15-25 years of age and love seeing pretty boys kissing, and are obsessed with shonen-ai, ecchi and yaoi stories in general, then you are a 'fujoshi'.
But don't go bragging about it, though, if you ever go to Japan.
Fujoshi is a despective japanese term that means 'perverted' or 'rotten girl' that encourages or glorifies homosexual relationships between men for her own satisfaction. It also has the connotation of a 'fallen girl'.
But wait, wouldn't this term be applied to the majority of fangirls like us?
Probably, yes. ^_^
Older women that like this genre refer to themselves as 'kifujin', or 'ochofujin', meaning 'noble rotten woman' or 'Madame Butterfly'. This is because the word 'fujoshi' is an homophonous take on the word of the same sound that actually means 'fine, educated lady'.
Fujoshi enjoy imagining what it would be like if male characters from manga and anime, and occasionally real-life male performers as well, loved each other.