same as such words as holy crap and such. A good friend of mine says, "Holy Catfish!" when he is at work (at a school) so as not to swear in front of his class.
Crappy place to work as it is the scourge is cheap people everywhere who like to order excessive amounts of Jr. Bacon Cheeseburgers.
CUSTOMER: "Yes I'd like 7 Jr. Bacon Cheeseburgers."
ME: "Damn the 99c Menu!"
Damn people then get mad when there 7 burgers aren't done in under 30 seconds because they obviously forget they are cheap and aren't the only people waiting for food.