An Alternative version to say back stabbed. It originates from the TV show Naruto, where Black
Zetsu back stabbed
Madara for no reason. Black
Zetsu's initials are BZ and thus the word was born.
Friend 1 "
Yo man can I have a pair of
scissors?"
Friend 2 then hands him scissors
Friend 1 then
stabs Friend 2 with the scissors
Friend 2 "Yo man that was a BZ!"