Drain the Main Vein
Slang for male urination this bit of slang came out of Atlanta Georgia whence drain the main vein became the vernacular for going to take a piss.
The word can be traced back to the metro atlanta area and has now populated across the entire American Southeast.
"Where you going dude?" -person 1
"I have to dtmv." -person 2
"Do what you gotta do homes." person 1