Well, I picked "cougar", but some of the words I remember hearing this year are:
"Whale Tail". When a girl wears high cut shirts, and low cut jeans, and the top of her thong is showing, looking like a whale tail.
"Tramp Stamp". A tattoo on the small of the back....that can be seen when a woman wearing the same outfit as above (thereby giving the nasty assumption that she's a tramp) bends over, revealing the tattoo, or "stamp".
"Muffin top". When a woman wears that same outfit in the first two examples, but perhaps a size too small, so that a little bit of "plumpness" laps over the top of her jeans, looking like a muffin top, overflowing over the top of the wrapper.
"Crotch Fruit". Children....a play on the words that your kids are the "fruit of your loins". Your "crotch fruit".