Green’s Dictionary of Slang

motherfucking-A adv.

[ext. of fucking-A adv.]

(orig. US) generally used for emphasis, absolutely, very well, very much, utterly, completely.

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[US]E. Torres Q&A 40: Motherfuckin’-A right.
posting at www.sonicfusionrecords.com 30 Jan. 🌐 The Motherfucking Darkness is coming to the Motherfucking Avalon in Motherfucking April. Motherfucking-A-Right they are.