Green’s Dictionary of Slang

synon. for motherfucker n.; also as adj.

1962		(con. 1950s) H. Simmons Man Walking On Eggshells 143: Get out the way, moa-fugg.
1982		(con. 1970) J.M. Del Vecchio 13th Valley (1983) 477: This mofuck division fucked up.
1987		(con. 1967) Bunch & Cole Reckoning for Kings (1989) 62: You be thinkin’ that, mo-fucker.
2002		K.C. Goldman ‘A Pound of Flesh’ on Bloodlust – UK 🌐 I seen you earlier too when you chewed at my face like you was some pit bull hungry enough to eat the ass hole out of a bear! That weren’t no bad-assed mo’fuck I saw earlier, J-Bird. That was some kind of snap case demon, one whipped up crazy.