In Portugal it means "shiting in the woods", or other remote places.
It can also describe , going behind a sand dune on the beach, to shit.
Its the act of defecating in a hidden place, its an illegal act of public defecation.
In Portugal Sophie is spelled Sofia, but both names are used.
where is Charles?
- He is doing "a Sophie" over does bushes.
where are you going?
-i am going behind does sand dunes to do "a Sophie"