From Wiktionary, the free dictionary
Bowdlerization of motherfucking.
muhfuggin' (not comparable)
- (African-American Vernacular, slang) motherfucking.
2006, Ron-Luc Nickell, Send in the Cones: the Cruise Ship Letters, Lulu Enterprises Incorporated, →ISBN, page 94:"You know I heard he'll take you off drive-thru if you blow him? Wonder if that's true... I hate working the muhfuggin' drive-thru...."
