myoukou pose
The unusually expressive pose and face that Myoukou from Kantai Collection makes in her medium/heavy damage CG (Danbooru post #1921442).
The pose became a meme, especially among Japanese fans, as oddly being a still shot of the actual act of the damage being dealt. (Virtually all other girls are shown just bruised and unhappy with their clothing damage.)
This is generally either used as the pose, itself, akin to Yamcha pose, or else as a mask of the expression Myoukou makes when she takes damage.