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..
2. A fool of epic proportion; oaf, nincompoop; a personage of supreme incompetence and/or stupidity.
3. The celebrated French author Alexandre Dumas (The Count of Monte Cristo).
"Yeah, dude. He's totally a Dumas."
"Yeah. Awesome though."
2. Dumas is also a state of complete and utter domination.
2. "What just hit me?"
"That was a Dumas"
Chris " Nope spent it on beer and imaginary stories"
Mom "Your a complete dumas."