Inserting an exact replica of your cock into your woman's ass while your own cock is inserted in her vagina, or vice versa.
Dude... I bought this penis casting kit and made a latex replica of my unit. Then the other night when I was f**king Carrie from behind, I lubed it up and slid it in her ass. Totally DuoTang'ed her.
by GrouchyRodent April 7, 2016
I just cut my finger on this obsolete duotang, I should not have been such a cheap skate and bought a real binder
by Ben777 March 19, 2008
by Saints Slang July 31, 2010