I never write comments, and I think they typically have a negative correlation to quality (this code is so f**ed up, plain english is, of all things, more clear and precise than code!). Unless you are releasing code publicly, and you are documenting the public API, I've never seen a valuable comment. I've seen plenty of harmful comments. However I wholeheartedly endorse using this otherwise useless but common language feature for swearing.
I think swearing in comments indicates you are unburdened by bureaucracy and pointy haired bosses (because they prohibit such things), which would certainly lead to better code.
I've been doing this for 20 years, so maybe? But I can't recall a single one excluding painstakingly maintained documentation for a public api where the source isn't readily available. I usually try hard not to read the comments and just read the code because comments are wrong so often.
I think swearing in comments indicates you are unburdened by bureaucracy and pointy haired bosses (because they prohibit such things), which would certainly lead to better code.