motherfreaking /ˈmʌðə(ɹ)ˌfɹiːkɪŋ/adjective 1adverb 1 adjective1 •(US, slang) An intensifier, used in the same contexts as freaking, but more intense.What I find insanely wonderful about this is that technically my friend is now driving a car which is powered by the motherfreakin’ sun. — 2014 adverb1 •(US, slang) To an extreme degree.He is one motherfreaking mean dude.