Green’s Dictionary of Slang

mollyfocking adj.

a euph. for motherfucking adj.

1968		T. Wolfe Electric Kool-Aid Acid Test (1969) 175: These mollyfocking Pranksters were test-proof. The Angels didn’t know what permissive was until they got to Kesey’s.
1978		T. Wolfe in Harper’s Mag. Mar. 117: The next one of you peckerwoods who [...] refers to me as ‘you mollyfoggin’ lamehead’ is gonna get a new hole in his nose [HDAS].