When a situation goes beyond the humorously wrong. Comes from a millitary term to describe the fact that soldiers under fire tend to cluster together for moral support, making them easier to hit.
We popped the flare and started shhoting. True to form they all bunched up in the ditch - your typical cluster fuck. One grenade later and it was all over...
by joskarith November 11, 2004
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A situation so awful that you will end up screaming the word fuck multiple times. The term cluster fuck simply is a proper noun for said situation.
Guy 1:Hey man not only did we have to pay 50 dollars an eighth for this weed but it was really shitty and we had to drive the dude all over hell and creation.

Guy2: Yeah man that whole situation is such a cluster fuck
by UnknownMan4411 January 19, 2010
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When a group of naked people all cram into a small space, and stick whatever they have in whatever hole they can find.
Wanna come to my party tonight? I’m planning a killer cluster fuck.
by Bolverkr September 5, 2019
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A cluster fuck is when a place is overly crowded, or extremely busy; when there is no room to do anything
"We decided to go to another restaurant because tsunami's was a giant cluster fuck.
by Urbandefiner.com February 16, 2017
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A term used to describe any situation where there are way too many people in a given area.

Blatent over-crowdedness, whether it's people, cars on the road, etc.
I tried for 20 minutes to get a drink, but the bar was a total cluster fuck.

I was hoping to get closer to stage, but it was a major cluster fuck down there.

It took me over an hour to get out of the stadium; they should really do something so there's not a cluster fuck of cars after the game.
by TD_Niners May 13, 2012
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