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.
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.