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1)The event in which pumice (an extremely light non dense pyroclastic vasicular rock) is blown by a breeze and acts in the same fashion as a tumble weed.

2) The title of the holiday/celebration/festivities/fiesta held on May 10th, during which one celebrates whatever they damn well please, however they damn well please.

*in both cases they got that pyroclastic flow*
1) Dude check out that Tumble Pumice, is practically the tumble weeds of the geological realm

2) Man, I got so blasted at my Tumble Pumice yesterday, and basically puked out my entrails

3) Rob Schneider is ... a tumble pumice?
by theglidemaster May 10, 2015
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