1. "Baby Bump"
I don't know why, there's just something creepy about this expression.
Plus it displays the emotional maturity of "look mommy, that lady has a baby in her tummy!"
2. "Man Cave"
I don't know what bothers me more. The idea that there are certain things, like sports, that are "man things," or that men who enjoy stereotypically male things should proudly consider themselves troglodytes.
The missus and I enjoy watching sports together. I would venture to think that we're fairly typical that way. We both enjoy bar-games like pool or foozball about the same. So why would I want a room that's a "no girlz allowed" "man-cave?"
3. "Pardon Our Progress."
When a business is remodeling, they used to put up signs saying "pardon our dust" or "pardon our appearance" or whatever which was followed by "we're remodeling to better serve you," or whatever.
Suddenly, someone came up with the idea to switch to the snide, sarcastic "pardon our progress." Why would a business want to go with the message "Oh, excuuuuuse us for wanting to make some progress! I know a Luddite like you might find this hard to understand, but this is what's called an improvement! Um, you're welcome!"
I know there are others, but off the top of my head, these are the three that irk me most.
Any others that bug you? Leave them in the comments!