The word can have swearing but not genderisation which might be offensive (mother) nor allusions to sexual dominance (motherfucker). Nor, other possibly offensive connotations. It seems that the word is commonplace and people won’t stop using it, so an alternative to the word may be useful. But the problem with alternatives, is that people might not use them unless they carry a meaning that’s attention grabbing in some way, and when it comes to this word it needs to be able to be used in either a serious (non-funny) or comedic way.
I always thought it was suggesting they were a person who dominates other’s mothers serially (rather than their own). Like a womanizer of mothers
Nah it’s a suggestion they fuck their own mother or an expletive used without any specific meaning like with the snakes on the plane bit.