Green’s Dictionary of Slang

(W.I. Rasta) father.

1905		Sporting Times 29 Apr. 1/1: I’m so sorry you’ve got those little things on, dada.
1956		J. Curtis Look Long Upon a Monkey 176: You’re on the biggest hiding you ever had in all your born days, the one that dada of yourn wanted to give you years back and save us all this trouble.
1975		J. Wambaugh Choirboys (1976) 306: Listen son. It’s me, your da da.