(noun) - A teacher who, during last period on a friday, assigns a project or a shitload of homework due next monday, effectively killing any chances of having fun during the weekend.
David: Man this weekend is gonna be crazy! Ready to rock bro?
Bro: Nah man, my history teacher gave me a long ass project due monday.
David: Damn, sucks to be you!
Bro: Yeah, Mrs. Karla is a real weekend vampire!