If you're looking for Vulgar Patches, The Cheap Place has you covered. These patches make use of all the four letter words and variations of them, so they're definitely not something you'd want to wear around children (unless you want your kids asking you what they mean). They're designed to tell people exactly what's on your mind. One of the most distinctive is the Dangerous Mother Fucker Patch.
One of the things I like most about this patch is that it's shaped like a Harley Davidson logo, and it uses their color scheme of orange, black, and white, too. At first glance, then, some people might think you're a Harley rider. However, if they take note of the words and not just the shape of the patch and the colors, they'll see what it really says. It's a great patch for Harley riders who just don't care what other people think about them. Sure, others could wear it, too, but it might look a little strange if you're seen wearing Harley colors on a Honda. Some might think you'd defected to the other side or something.
The Dangerous Mother Fucker patch measures three inches long by two and a quarter inches wide. It's a bit bigger than some patches, but it will still easily fit on jackets, vests, or even pants. Like all patches, you can iron it on or sew it on if your clothing is made from leather.