Getting yoshied is when someone takes advantage of someone else by pushing them down to achieve their goal. This is the same as when Mario ditches Yoshi to make a jump. Yoshi, the ever loyal steed and friend is dropped in a hole while Mario gets some extra height and distance.
In Bell Hook's essay, Revolutionary Feminism, she claims that rich white women yoshied off the black women to get their extra privilege.
The name for a man who is extremely gay, yet is quite popular around conventions, especially anime conventions. Usually much lauded as a celebrity among most regular congoers, a Yushi is sometimes mobbed by unsuspecting fangirls who have no idea as to his sexual orientation. A Yushi, however, hates this female attention. He likes men. Especially their butts.
As a side note, a synonym for this is Lord Baltimore. They are one and the same.
"God, that man is such a Yushi. I mean, he just completely turned down that girl. And she was hot!!"