An expletive, possibly the most aesthetically pleasing in the English language. A multi-purpose phrase commonly used as an expression of anger, pain, frustration, wonderment or disbelief.
After stumping his toe on the hearth, grampa screamed, "Fucking Christ!".
"Fucking Christ" the teacher inaudibly sighed as Susie answered "Louis Armstrong" when asked who the first man on the moon was.
After her first sexual tryst, Maxine rolled over and in a long exhale, uttered "Fucking Christ..." as she sank into the bed.