Definitions by This Name's Taken Already

seismonic 

A misspelling of the band Semisonic, known best for their hit "Closing Time"

Jack: Yo dude I totally heard this cool song from the band Seismonic! *starting to sing the one part of closing time that everyone only knows*
Greg: Um do you mean Semisonic?

seismonic by This Name's Taken Already December 3, 2019