FU factor - Old nautical term.

We all been there or at least I have it starts with the exclamatory form of the word "OH ----" usually followed one of two single words; one is slang for having sex and the other is to defecate / or a rapid session of a long string of words spoken in high squeaking sucking voice that do not make sense at all.

F is for the "F" word, G-Rated version is fouled, in past or present form U is for up.