Green’s Dictionary of Slang

(US) synon. for motherfucker n.; thus mo-dicking adj.

1969		in Current Sl. IV:3–4 (1970) 21: Mo dicker, n. A lazy, irresponsible person.
1987		(con. 1968) Bunch & Cole Reckoning for Kings (1989) 291: ’Long as Blind Pig be here, be nobody’s mo-dickin’ Christman fucked up.