Someone that is obsessed with anime and anime people, they are often introverts so they don't really have any girlfriends/boyfriends/friends and usually don't come out and they like to live in the dark, when a weeb goes outside they will go insane, unless they're buying anime and food.
you: hey weeb
the weeb: ...
you: WHY ARE YOU OUT HERE
Weebs are just people who like anime porn they jerk off to it even when someone talks about one ep. Of anime I dont care if your a weeb if you are you are probably reading this and jerking off to anime porn