An extremely useful phrase that can be added to just about any statement to add emphasis of something nasty or strong.
Said emphasis may refer to, but not be limited to, the strength of a smell, the power of a punch or hit, poor taste or any other situation where accentuation of something nasty or rank is needed.
There's three types of people in the world, there's a Single, McDouble, and a Happy Meal. You don't feel good enough for the Happy Meal and you really don't want a Single. You try for the McDouble, and you get a McDouble with a Hair In It.
An phrase commonly used by salespeople to express that a deal or sale which should be be simple, is not, due to multiple items complicating it. A situation that is complex due to multiple uncommon complications involved.