Top Definition
When a line of people that were waiting for a train to finally end fist pump out the windows of their cars in celebration of the caboose passing so they can now cross the tracks. Started on July 3, 2010 in Olmsted Falls, Ohio.
The caboose of a train passes as the train ends. The people waiting to cross the tracks celebrate by Caboose Fist Pumping out their car windows.
by mathiasj July 06, 2010

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