Fucking Your Way Out
These words are simply aural punctuation points. It's like FLIPPING ON ALL CAPS when you speak. I mean YELL. It has the precise same negative effect in that it makes you look like you can't use words to illustrate your point - so you FLIP ON ALL CAPS.
Rob Conery explains how swearing in presentations is really a sign of intellectual laziness. Scott Hanselman approaches the topic from a different angle, but reaches similar conclusions: despite of what David Heinemeier Hanson says, proffessionalism is still a virtue and swearing is a sure way to undermine it.