kneebaby Share definition Flag An African-American term for the child who stands next to his/her mama's knee, while mama holds the armbaby. "Se done died when se was a kneebaby. A high wind come and took her breaf away." kneebaby by bagitbabe May 16, 2008 0 0 Get merch Get the kneebaby mug. Buy Now — $32.95 See more merch