A "TismTasm" is when an individual has a tantrum fueled by their "tisms" (short for autism). The "Tasm" is a modification of the word "spasm" by alliteration to better match with the word "tism".

Overall a TismTasm is a spastic tantrum fueled by mental retardation. The individual may be screaming incoherently, throwing and/or breaking things, and not being able to communicate properly with those trying to calm him down.
"yo whats wrong with Greg? He's jumping up and down screaming and flinging shit against the walls"
"He's having another TismTasm cause he lost in Mario party"
by ouncegod February 23, 2020
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