Sometimes my workmates say when i make a joke with them 'sacré mark' ,mark being my first name.

I understand the work sacré but in this context what is the trnaslation in english?

 

"Good ol' Mark", is the way I'd translate it (If it's said in approving way).
"Bloody Mark" might be another, of course

 

Sacré Mark is normally a positive phrase. The negative one would be satané Mark, I guess...