Motherbitchin is the increased Motherfuckin
Used by Steve Marriott of Humble Pie as an introduction on the King Biscuit Flower Hour Bootleg in the song "C'mon Everybody"

"We came to Frisco to play some fat fat motherbitchin Rock n Roll"

Motherbitchin is stronger then Motherfuckin ! -> its the best Rock n Roll
by Steve91 October 28, 2013
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