December 1st Ask Urban Dictionary about December 1st Share definition Flag the day all girls must send there boyfriend soapy boob pics to mark the end of NNN and the start of DDD. boy: "hey baby u know what day it is" girl: "yep, December 1st im sending them now" December 1st by ur..maw November 23, 2020 0 0 December 1st Merch Get the December 1st mug. Buy Now — $32.95 See more merch