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1.
french for bum or behind , not made up slang created by rappers: spelt derrière. Rapper are not that smart!!
renault advert 'shacking you ass' le derriere (derier)
by 123a July 23, 2006
 
2.
another word for ass or butt. more slang created to be used to rhyme in a rap.
"everywhere he go, the stench fill the air, stick that fucking cork in your ugly derier, leave yo ass bare, leave yo fuckin ass bare, stick that fuckin cork in yo ugly derier"
by LB skandoman April 04, 2005