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Jamaican Origin.
A phrase suggesting that the desired effect of success or approval has been achieved.
Yo, the party last night night Sell Off !!!

Hey that outfit Sell Off !!!
by SparkyDon October 18, 2007
Ususally used in Jamiacan english, the word "sell off" means something is very nice or very good.
dat party yesterday haffi sell off
by gumbor December 14, 2006