PeteAlone, take a look at the fourth post of this topic.
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mozdasamjamozdanisam has provided decent answer.
However, the equivalent literal 'expression' would be -> " I f*** Your Mother".
When people with native english swear, instead of Y*e*b*em ti mater .. they would simply say " I've been with your mommy, you dirty prick!" .. something like that.
If I understood well, if You actually wanted to compare the -weight- of those, well.. words.
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