Factual error: When Mike is hunting after his return he switches from left hand shooting to right hand and his rifle also switches the bolt on the right to the bolt on the left.
Factual error: The film is supposedly set in 1968. However, after Nick was released from the hospital in Saigon and entered the Mississippi bar, the music being played on the jukebox is Midnight Train to Georgia by Gladys Night, released in 1973.
Chosen answer: The whole phrase is "di di mao", which basically mean go now, or hurry up.
MasterOfAll