Manspreading: When a man spreads his knees so wide that he takes up more than a single seat on mass transit.
Womanspreading: When a woman let's her ass get so big that she no longer fits into a single seat on mass transit.
Take a wild guess which one I saw more of this morning on the uptown 6 train.
My bet is that you'll have better luck asking a guy to move his knee than you will asking a woman to lose some weight, but I'd strongly recommend you try both and videotape the reactions. I promise to post the results here for the next time some Feminist goes off on a rant about the rudeness of men.