Some of the things that tumblr come up with is just special words for normal things. Instead of tomboy/effeminine boythey've got demigirl/boy (or whatever). Instead of just "straight" they've got some cis thing going on. And being bisexual isn't enough, they have to use a lot of fancyschamsy words when they are, essentially, bisexual. Cause bisexual isn't cool enough.