In football, a type of block in which a player hits another player with enough force to knock him down, with the blocked player usually landing flat on his back.
To be flatten by something or someone, it is call pancaked. When pancaked, the person is squish to a very small height but more in length, pancaked is use to describe a person get flatten so flat it is like the size of a pancake (Or paper). The person is unable to move and couldn't do anything, and are defenseless. Person who are pancaked can be pick up and throw or turn over.... :D
Usually done by hitting someone with a hammer or a large object falling on them in anime and games.