This catchphrase comes from an online game called Rush
Team.
When a Veteran player named Doomdoo would start loosing a match he would stop using guns and start killing all his enemies from behind only with an
axe. Other players would scream “attento dietro” that means in italian ( look out behind ) . It became a catchphrase used by many players (most notoriously by Hurakan9000 the first person to say it ) every time the player Doomdoo would
get angry, hold an
axe or simply start loosing a game.
Doomdoo killed player1 with
axe
Doomdoo killed player2 with
axe
Doomdoo killed player3 with
axe
“Player4 : Guys, attento dietro”