Usually this term is in reference to a certain person whom is completely unliked by another.
This term can commonly be found used to describe George W Bush or headteachers.
Two part word:
Fucking - sexual conduct ( :) woo ), in this case used for emphasis.
Twat - a pregnant fish or female reproductive organ.
"That guy is a full on FUCKING TWAT, i wish somone would force feed him spandex while slapping him with a live chipmunk."