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1.
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
 
2.
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