Used in the same context as fucking, but slightly less vulgar, yet still bearing the same context instead of "fiddlesticks" or some such other bullshit.
Me: Damn, I have to work Saturday again? This is the 3rd ufking time I've had--
Over-Sensitive Politically-Correct Mormon (interrupting): Hey! Watch what you're saying, there's kids around!
M: I know, hence the ufking, dummy!
OSPCM: No, I meant the "d-a-m-n" part.