The act of defecating off a cliff or any tall object. Safety note: Always base dump with a partner and never base dump into the wind with flu like symptoms.
Steve asked Fred to hold his wrists while he attempted his first base dump off the roof of his dorm.

Tim was disappointed and a little dirty when his base dump got stuck on his windowsill.
by RG2486 May 25, 2009
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When someone takes a poop or a "dump" off of a really tall building.
Person 1: let's do something fun. Person 2: like what? Person 1: how about we go base dumping
by Kadin Ellis October 19, 2015
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