An ignorant fuck. Usually referring to a person from Europe who thinks they know American culture by watching our media.
or
Someone who views Americans of all races as inferior and bastardized in language and culture.
This word has become more popular since after 9/11.
Ever have something good going and it all goes sideways? That's a Lort.
Person 1: "Did you ever finish reading that book I gave you?"
Person 2: "Yeah! It was pretty good up until it took a Lort and killed off the main character."
Person 1: "I thought you liked plot twists?!"