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Explanation: In colloquial (and, particularly, street) conversation, "Su madre" is a standard comeback to an insult offered by another person. The implication, of course, is that whatever rude or indecent suggestion has been offered likewise applies (either actively or passively) to the speaker's mother.
This usage may not be the intended one in your context, but it's worth knowing about!
Heathcliff United States Local time: 23:25 Native speaker of: English PRO pts in pair: 843
Explanation: In colloquial Spanish, any insult is made more intense or serious by the addendum, "su madre". Why is this more insulting? Culturally speaking, the mother is the most revered member of the household and insulting the mother of the household is getting right at the jugular vain of the person with whom you are disputing.
Street experience, plus several slang dictionaries