The act of being spontaneous, especially in times where the spontaneous act surprises others.
The spontaneousity of Jess screaming during a time of dead silence.
by Silverose September 28, 2008
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The act of doing things without too much thought just for the thrill. Usually ends up being an adventure.
Andy took Danny out on a surprise date. Danny found his Spontaneousism flattering .
by Bruja June 5, 2018
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