A very popular derogatory slang South African term, literally meaning "your mother's vagina". Used
across the board to insult someone (more so their mother) or to express anger at and
individual, situation or item.
More often than not it is a quick way to provoke someone and a sure way to cause a fight.
Sometimes shortened to just "your ma se...", which is just as
effective. Or even expanded as in "jou dubbele ma se poes".....
Also heard often when someone hurts hurts themself, e.g stubbing your toe....."Eina!! Ma se poes!! That hurts!!