Being an alternative to waifu, a bestgirl is ones favourite character in an anime or a manga
memer1: Krulcifer Einfolk is bestgirl
memer2: You need a real girlfriend instead of a waifu
memer1: Fuck off, 2d girls are better
memer2: Sure but you cant fuck your computer
memer1: I can use a fleshlight while browsing pictures on my computer
memer2: ggwp