A completely unorganized gathering of people, usually involving a task that all the people must complete.
The baggabe claim at the airport was a cluster fuck; people had no clue where they were going.
by Pesticide 5 September 6, 2006
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A person who treats the medical condition of cluster headaches by using hallucinogenic substances, especially shrooms.
I used to suffer a lot with cluster headaches, but since I became a Cluster Buster I haven't had a single headache.
by JJA December 22, 2004
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When you go to Miami University (of Ohio not Florida you fucktards) as an honors student, you sign up for a cluster of 2-3 classes in a topic you kinda choose (you make a list of preferences of clusters over the summer and most likely you won't get the one you want and get a crappy one you don't like and half of the original clusters you choose from get ELIMINATED!), then you are cluster-fucked.

Or when your cluster forces you to take a certain route in your academic career to avoid wasting class space in later semesters (even if you end up not liking the cluster classes or topics you are in) you have been CLUSTER-FUCKED.
You're a Math major in a seminar for chemistry majors? Wow, you got cluster-fucked!

I wanted to take physics classes for my major, but because I was cluster-fucked I have to take chemistry classes instead.

I signed up for one cluster, but I got cluster-fucked into another one I don't like.

Miami is cluster-fucking me.
by PRAOCH October 14, 2009
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A rare medical condition causing severe head pain. The "headaches" tend to occur in clusters; One often gets 6-8 attacks per day for a few weeks, but then goes in to remission for several months. They are referred to as "suicide headaches" due to the high suicide rate among sufferers. They are often said to be the worst pain regularly experienced by humans.
My uncle killed himself after suffering for years with cluster headaches.
by JJA December 22, 2004
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generally small occurrences that exponentially improve a series of situations considered a 'cluster fuck'
Cassie: What a CLUSTER FUCK! Not only did my car break down but I just dropped my keys and they slid between the elevator shaft that is going to cost me 200 dollars! To make things worse, when my dad was researching repair methods for my car he downloaded a virus that fucked up my computer!
Zack: Its okay! The elevator people came out for free. I fixed your computer and your dad felt soo bad about fucking up your computer he put in new breaks and rotors! What a cluster fix!
by acowfrog April 16, 2009
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A cluster headache is one of the most painful types of headache. A striking feature of cluster headache is that the attacks occur in cyclical patterns, or clusters — which gives the condition its name.

Bouts of frequent attacks — known as cluster periods — may last from weeks to months, usually followed by remission periods when the headache attacks stop completely. The pattern varies from one person to another, but most people have one or two cluster periods a year. During remission, no headaches occur for months, and sometimes even years.
"Long story short, got the MRI--it shows that I am suffering from cluster headaches AND migraine headaches."

"My cunt for a step mom is always sick. Those damn cluster headaches have been bothering her for years.
by Jack Holiday November 13, 2009
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'Cluster Cells' are a group of cells that can appear on the penis when it is unclean. These cells can cause smegmal discharge to be emitted from the penis.
VEGAS: "CLEAN THAT CLUSTER OF CELLS"

VEGAS: "WE NEED A ONE AND DONE CLUSTER CELL CLEANER"

Dee Dee: " '-do you know if Nader has any Cluster Cells?' What do you mean by that? I'm not sure what you mean miss Holly."
by Sev_iRib_Farthouse_RealTV November 14, 2022
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