Top Definition
clusterflake is the social phenomenon characterized by a buttload of people just not showing up, typically so sporadically, in such numbers, and with so little advance warning that the original plan or plans are thrown into disintegrating disarray. (syn: cluster flake)
"Despite a week's notice more than half the movie group clusterflaked, most without even calling."

"We'd arranged a big dinner, followed by a meet with another crew, then all hit a party downtown. Three people showed up in total, the whole night. It was a complete cluster flake."
by Dude I Flaked April 21, 2008
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