its the sentence you should always say before you smack
something round or shiny or newly shaved.
It's origins are not confirmed as it has been remade many times but all the evidence point out to this one vid where A DUDE SEES HIS SMALL 9 YEAR OLD OR
SOMETHING BROTHER
PLAY MINECRAFT AND THEN THEY GUY SAYS THE SENTENCE AND WHOPS THE KID'S HEAD, RESULTING IN A EAR DEAFFING SCREAM...