whoever spelt "du" as "dou" is a dumbass
the phrase originates from south vietnam.. you might also here "
dit me may" which means the exact same thing, but is used my nothern vietnamese people for their dialect is slightly different by means of accent and a few words.
DU MA MAY means fuck your mother..
DU MA means mother fucker..
"du ma
thang sau nay" = "mother fucker, this ugly guy" or.. "this mother fucking ugly guy"