We should presume that the phrases "fuck your mother", "fuck your mother smelly cunt", "mother-fucking bastard" existed in the Chinese alt-cultural vocabulary for centuries in various dialects, having a high frequency of usage when the need for profanity arises. May be, I need to verify with people who speak the language/dialects. It is accepted that the term
mother-fucker in English originated in the United States around the 1970s and not earlier than the 1960s. And that it was popularised by African American gangsters.
I am proposing that the English term
mother-fucker came into existence due to the confluence of Chinese and African-American cultures. I am theorising that its existence is due to among other such confluences, the interaction and/or cooperation between Chinese Triads and African American gangs which started to occur in the 1970s.
Imagine the scenario - a botched co-operation between an African-American and their Chinese counterpart - so the Chinese gangster yells at his African American partner "Fuck your mother". Or a racist Chinese grocery store owner, shooing away Blacks he feels are not in his shop to spend money. So, the African-American yells back, "Fuck your mother, you mother-fucker." And the phrase took off.
I am arriving at this scenario, because of my personally having witnessed a verbal altercation between a Chinese. Malayalam and Sinhalese man in the far-east in the 1970s. where the Indian men each yelled back, "Fuck your mother, you mother-fucking bastard", in response to the Chinese man's yelling "Fuck your mother". I mean, these three men were actually friends but they somehow got into this amazing deprecation match. Which means, I personally witnessed the English term
mother-fucker used in one instance in the early 1970s, not in the US, but in the far-east, by three English-speaking Asian compatriots of different ethnicity in a recreational verbal-bantering match.
Certainly, my observation and theory would be disagreeable to many African-Americans who claim that the term is purely of African-American origin.
So, what triggered the existence of the term in English? Did African-Americans use the term in the 19th century? Is the term purely of African-American origin?