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2.
slang for simmer down now,also means calm down now
Barry!Simmadown now!
by Matt February 10, 2003
 
1.
verb- To calm down, quiet down, or keep it down.
1st and ten SIMMA takes the snap drops back fires DOWN in the endzone for a touchdown NOW cmon hits the extra point. It's SIMMA to DOWN followed by NOW and it's SIMMADANA!!
by CarolinaGuy May 16, 2003