A military term applied to a disorganized gathering of service personel, often times at the entry of a military building or common route which obstructs or hinders passage of other personel.
"We can't get into the barracks. There's a cluster fuck in the way."

"Get in rank you maggots. This is a total cluster fuck."
by kamikaze762x39 June 19, 2007
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
the mixture of peanut-butter and fuck
Girl : omg there's peanut butter everywhere
Boy : what a cluster fuck
by lelebebee4547 July 26, 2010
Group sex. Often called an orgy.
Fuck threesomes! Clusterfucks are where it's at!
by Damantha March 11, 2010
a huge cluster of fucks
when people go in a room with a bunch of people and clusterfuck.
by Jempus December 04, 2009
When everything that everyone does seems to backfire into one, giant, unfiltered mess. Usually involves Mongolians.
Well, that's one great big Clusterfuck.
Of Mongolians?!?
by maynard j gillis October 09, 2009
Any Halo 3 match.
The guys just kept respawning... heading over to the control point... killing the guy there, getting killed by the guy right behind them. It was a total clusterfuck.
by cjwright79 January 04, 2009

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