When multiple people enter an establishment to make only a single transaction, unnecessarily complicating a simple job by sheer weight of numbers.
Five students holding a table by ordering a single beer; that's a clustomer.
I'll call you back, a clustomer just walked in. I'll need a drink after this.
by Bobannaliffia May 3, 2015
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A misguided customer by their actions or by any part of an action that they are responsible for, that has caused an enormous, near indescribable mess of mass proportions, which, as of now, best describes them.
Oh man! I was dealing with this Clustomer today that must have had their head on backward.

I am not sure how long it will take to clean-up the mess that they made or undo the things that they did. It would easier to just start over but we have already spent 3 days trying to explain that they are doing it wrong
by >turn-about-intruder< August 11, 2021
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a group/cluster of women on a shopping trip.
Shop owner says to her sales assistant:

'Standby, here comes another clustomer'
by Gillian McFarlane May 30, 2007
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A difficult customer; one whose actions or reactions to price, organization or just reality in general makes planning and execution infuriatingly difficult. That is, a cluster-fuck generating client. Also most interior decorators.
We could have done this six-week remodel in two weeks if we'd had a regular guy instead of this friggin' clustomer.

Massive cleanup on Aisle 6 -- clustomer at work!
by masta grammastafarian February 28, 2013
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A misguided customer by their actions or by any part of an action that they are responsible for, that has caused an enormous, near indescribable mess of mass proportions, which, as of now, best describes them.
Oh man! I was dealing with this Clustomer today that must have had their head on backward.

I am not sure how long it will take to clean-up the mess that they made or undo the things that they did. It would easier to just start over but we have already spent 3 days trying to explain that they are doing it wrong
by >turn-about-intruder< August 11, 2021
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When you have a client or customer who is a absolute clusterfuck to deal with, hence clustomer.
Man these guys are so hard to deal with , a total clustomer!
by MrGib September 16, 2017
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An individual, group or company that employs your services but has no clue about what they need and have the tendency to always mess things up.
Bob is a nice guy, but is our worst clustomer.
by Quiver January 26, 2023
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