Green’s Dictionary of Slang

mammy-jammer n.

euph. for motherfucker n.

1959		J. Blake letter 23 Sept. in Joint (1972) 146: The stumpjumpers have been forced to imitate the black mammyjammers.
1962		(con. WWII) J.O. Killens And Then We Heard The Thunder (1964) 32: Now ain’t that a mama-jabber.
1965		D. Pearce Cool Hand Luke (1967) 25: That mammy jammer got right up off’n the floor.
1967		(con. 1950s) McAleer & Dickson Unit Pride (1981) 31: You ... dirty Yankee mammie-jammer.
1969		H. Rap Brown Die Nigger Die! 109: I’d bought a rifle, which was not illegal at that time, and it was a sweet mama-jammer, too.
1969		Steward [song title] Baddest Mammyjammy.
1977		Maledicta 1 (Summer) 11: There is also a whole lesser spectrum of obviously burlesque and mocking synonyms for the same thing, such as granny-jazzer, mammy-jammer, momma-hopper, and poppa-lopper. These are used to raise a laugh, not to start a fight.
1982		B. Downey Uncle Sam Must Be Losing the War 59: What the fuck do we do with three of these mammy-jabbers? [HDAS].
1983		K-9 Corp. ‘Dog Talk’ 🎵 See just the other day, I would like to say / I was doing the dog in a vicious way / Then a big mamma-jammer dogged through the door / Snatched up my partner / Then she hit the floor.
1989		G. Tate ‘The GOP Throws a Mammy-Jammy’ in Flyboy in the Buttermilk (1992) 100: A true daughter of Memphis, Mother Tate was ecstatic, and advised her son to come cover the mammy-jammy.
2000		R.G. Barrett Leaving Bondi (2013) [ebook] ‘I am a bad mamma jamma’.
2002		‘Touré’ Portable Promised Land (ms.) 159: We Words (My Favorite Things) [...] Phi slamma jamma. Bad mammajamma.
2022		I. Fitzgerald Dirtbag, Massachusetts 105: [S]ome young jammer like you who can’t handle his booze.

In derivatives

mammy-jamming (adj.) (also mama-jabbing)

euph. for motherfucking adj.

1946		Mezzrow & Wolfe Really the Blues 116: More real woman than those Jim Crow mammy-jamming whites would know what to do with.
1962		(con. WWII) J.O. Killens And Then We Heard The Thunder (1964) 31: I’m the best damn cook [...] In the whole mama-jabbing Army. [Ibid.] 85: A cracker is a mama-jabbing mother-huncher.
1977		J. Langone Life at the Bottom 76: It packs hard as a mammy-jammin’ cement load.