I've always used it in a civilian context but the top definition from UD is...
Military term for an operation in which multiple things have gone wrong. Related to "SNAFU" (Situation Normal, All F****d Up") and "FUBAR" (F****d Up Beyond All Repair).
In radio communication or polite conversation (i.e. with a very senior officer with whom you have no prior experience) the term "Clusterf**k" will often be replaced by the NATO phonetic acronym "Charlie Foxtrot."
By the time the artillery came in the enemy was already on top of us. It was a total Clusterf**k.
Click to expand...