What does this English joke mean? TAT's lines in House of Cards mean I don't understand.

Translation is basically the same as upstairs, involving a little English grammar.

The girl from Georgia asked-where are you from?

The girl in Connecticut replied-we come from a place where the preposition ('from' in the text) doesn't end the sentence!

The girl from Georgia asked again, "Where are you from, bitch?" ? (So it ends with the noun "vagina")

Ironically, people who follow the rules are rigid, as Margaret said to the editor-in-chief of the newspaper in the play.