Da'in't Share definition Flag A contraction of did not and is not. To be strongly opposed to in the past tense. "Yo, Tyrone tried to rob your momma!" "Oh no he da'in't!" Da'in't by tyronewillisthesecond December 24, 2011 0 0 Get merch Get the Da'in't mug. Buy Now — $32.95 See more merch