A terrorist grown in the depths of their mother's basement who sprouts up to kill people, and then generally dies.
Typically a white nationalist incel.
- Did you hear about the latest mushroom terrorist?
= You talking about the one in El Paso, or the one in Dayton?
- Yeah you heard. Man, they're really lovin' that shit trump's feeding them.
by TuckerTrash25 August 5, 2019
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