I'm sorry but can you guys tell me what is bi and twincest?

And also fujoshi and fundashi

bi is when you like both men and women and twincest is when twins like each other

Fujoshi is used to refer about girls who likes BL manga. And fundashi is what boys are calles when they like BL.
BL means boys love, aka yaoi, although its definition could not be as simple as that.

It's fudanshi, not fundanshi :]

Bi = bisexual. People who likes both gender men & woman. So it is man who likes man & woman. Or woman who likes man & woman.
Gay = Man to man only
Lesbi = Woman to woman only
Fujoshi = Female Fans of yaoi (Boys Love story/ Gay love story)
Fudanshi = Males Fans of yaoi (fudanshi are not always gay. Some them are straight)

Thanks you guys(⌒▽⌒)