An intensifier, used in the same contexts as fucking, but more intense.(adjective)
To an extreme degree.(adverb)
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Use "motherfucking" in a sentence
"And fortunately for all, you are that fucking good in motherfucking Louisiana, the antediluvian "way out"."
"SOMEBODY (i.e. my neighbor) couldn't STAND the fact that my yard was lush and green so he had to go and call the motherfucking Lawn Doctor to come out and fix his shit up."
"I'll keep my eyes peeled for future "motherfucking" and "cockdoucheweaselmonkey" quantifiers from you."