Coat day Share definition Flag The day in which a young african american boy recieves his well earned pay, and can invest in a fine Jacket or Coat. Nizzle, I just got payed, its coat day! You lucky its coat day, fool. Coat day by Cthulhu August 5, 2004 0 0 Get merch Get the Coat day mug. Buy Now — $32.95 See more merch