The process of wiping one's own butt with both hands, front and back, at the same time.
I had to duplex my wiping process to save time after I took a sloppy dump.
by Plerk November 30, 2017
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A duplex lived in by a group of young guys who never clean up, never throw away garbage, do not do any dishes and whose sink is always clogged. A Dirty Duplex is completely disgusting, smells rancidly at all times and guests can never be brought over to visit.
This guy from work showed me pictures of the Dirty Duplex he lives in and it made me want to puke.
by GSP December 6, 2007
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The best mother fuckin cost-efficient cookie ever made.
Amanda: When you go to the store please buy me some chips ahoy.

Joey: Fuck that! All I have is 80 cents so I'm gettin some duplex cookies sandwich cremes.
by bama_slammer January 29, 2012
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When a guy stacks two women on top of each other and is able to have vaginal sex with both of them during a threesome. If the guy gives either or both girls a creampie the duplex is said to be occupied, otherwise, it is considered vacant. The girls can be stacked in any manner; front-back, front-front, or back-back and they can face upward or downward.
"I was able to fuck Gina and Brooke in a Milwaukee Duplex. I occupied both of them; I hope they are on the pill!"
by Milwaukee Guy June 12, 2007
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Overhanging, enlarged vaginal folds resulting in the appearance of a two-story pussy...
So I saw this heavy homeless woman having a pee in the dunes. Before I could look away she hiked her skirt and I thought "Yikes! Duplex pussy."
by LMS Miami February 3, 2012
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Far worse than the traditional herpes simplex. This is a case of herpes infecting both genitalia and mouth. So it is some nastee stuff. Steer clear.
You don't want that chick, she's a walking case of herpes duplex.
by bobert_ohio February 9, 2008
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