Andyesque
This adjective describes a terrible defeat, particularly one caused by one's own stupidity or general unawareness of one's surroundings to be remembered as an embarrassment to the future.
*Character jumps off the edge in SSB*
Player 1: "Oh come on!"
Player 2: "Dude, that was such an Andyesque move."
Player 1: "Oh come on!"
Player 2: "Dude, that was such an Andyesque move."