Just think about that word for a second.
Jeans. And leggings. Mashed into one. Think jorts. I can't really imagine a situation where jeggings would be appropriate. Ever. And I have recently been seeing a lot of stores that are selling jeggings. So ladies, please don't be swayed by the 5'11", 100lbs model wearing the jeggings in the advertisement above them.
Now, I'm not talking about the jeans that are skinny and tight that some places call jeggings. I'm talking about the ones that aren't made out of jean material, that probably don't even have a zipper, and that definitely don't have any pockets.
Instead, opt for the skinny jean, or just the plain ol' legging (but don't substitute these as pants, if your legging butt is showing, wearing a longer shirt or put on some bottoms)