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Term used to describe the opposite of clusterfuck. When multiple fun and/or good things occur.

May also be used as sarcasm in place of clusterfuck.
The all-expense-paid trip to Disney World was a clusterfun. Everything went great!

Getting a flat tire, being late for work, and then getting fired was sure a real clusterfun.
by She's-just-too-much October 18, 2013