Do Friend: Como utilizar

Hi folks, I have a question, last year I heard my friend says that "do friend" has the same meaning that "fuc*", but i've never asked about it here, today I've solved to search about that in "Google search", but I didn't get any results about that, so I've solved to post it here, and I'd like to know if there's anyone here who lives in USA or someone who knows that expression to answer my question.

Is there any difference between "do friend" and "fuc*"?

Thanks in advance.