Kablah
Kablah is a Klingon swear word so bad it could make a baby cry. Mel Gibson uses it to scare people and also to threaten his neighbors. If you say it in front of a Klingon, they might beat you to death with a spoon.
Mel Gibson yelled Kablah at the mailman and he ran away screaming.
My uncle said Kablah at the dinner table and my aunt fainted.
Klingons heard Kablah and started a war in the cafeteria.