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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!!
de CarolinaGuy 16 mai 2003
 
2.
slang for simmer down now,also means calm down now
Barry!Simmadown now!
de Matt 10 février 2003