A shrimp girl is basically a slang regarding to that kind of girls that work-out a lot trying to keep there fit bodies that Almighty God gave. But God got so carried away on sculpting the body that he forgot the face.
In a nutshell, Shrimp Girls have a hot body but they're not beautiful.
Shrimp is because when we are going to eat a shrimp we are supposed to take its head off before eating.
Guy 1: That girl over there is a Shrimp Girl.
Guy 2: A Shrimp what?
Guy 1: Shrimp Girl.
Guy 2: Shrimp Girl? How does it work?
Guy 1: Well, you know...wipe out the head, eat what's left
When one leaves the school, many of what one learned won't be used now on, but anyway, there are some stuff one have to know how and when to use, as a matter of avoiding huge embarrassing moments, like the use of comma, specially when chatting indeed.
Guy1: Hey!Hey!Hey dude!
Guy1: Hey!Hey! Hey duuuuuuudeee!
Guy2: I'M EATING SHIT!!!!
Guy1: hmm….well….aah…ugh…I think you should put a comma after eating, seriously.
Guy2: oh f***, that's the third comma fail today, shit!