Green’s Dictionary of Slang

motheren adj.

[pron. of mothering adj.; also used adverbially]

(US) a euph. for motherfucking adj.

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[US]W. Miller Cool World (1965) 15: Man but my goddamn heart won’t stop poundin. I can hear it in my ears. ‘Oh you motheren heart,’ I say.
[US] in S. Harris Hellhole 130: Anything happen to my baby, I find you motheren coppers wherever you at [...] You son of a bitch coppers. You motherens.