Has absolutely no specific meaning. It is used to spite someone for petty reasons. When somebody calls you this it is because they are and insecure cunt or a little bitch.
Just don't be a jane mother and its fine.
Akin to calling someone’s mother a whore
“The one who is called your mother wears the boots that are made for COMBAT!”
The president of his fanclub
scout (aka red spy): what are you president of his fanclub?
spy: no that would be your mother! (slams pictures of scout's mother being fucked by red spy)
the word your mother refers to a woman who is morbidly obese
jim carey the mask - "your mother is one fat ass ni-"
Sean Connery's insult to Alex Trebek on SNL's Celebrity Jeopardy
Alex: Sean Connery in the lead with -17000$
Sean: That is what your mother said last night
Fat; black; Tyler Perry; Whoopi Goldberg.
Your Mother was nice last night.