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1.
This term was coined by a great artist. It is used in describing something that is unfair, jankety, smelly, bullshitty, unpleasant, unfortunate, etc. In rare cases boomsquash can also be a triumphant term (replace beyaaawhh!, or booyah
!).
"hey bro we're out of beer."

--"boomsquash."
or --"thats fucking boomsquash son."
or --"Your boomsquash ass drank it all."
by BDOOKS June 13, 2011