A more
polite but equally comprehensible version of "For fuck's
sake". They'll know what you restrained yourself from saying. Can be
used in both senses of the original phrase.
1. "Isn't that your
girlfriend with Texas Pete over there Superted?"
"For fudge
cake! I just bought the heifer a holiday!"
2. "For fudge
cake, please refrain from sticking your fingers in the fudge cake."