Does being bi mean a 50/50 split between girls and guys?

I just got in an argument with someone about being bi, they said that being bi means being equally attracted to both men and women. I say that that isn’t true, im bisexual asf, I prefer women, but that doesn’t change the fact that I also like men. So does being bi mean a 50/50 split between girls and guys?

Edit: There seems to be a lot of answer containing the fact that there are more genders than guys and girls, although I am fully aware of this FACT it does not pertain to the argument I had, sorry and thank you. - Rhino