D and T are the fourth and twentieth letters in the alphabet, thus, DT stands for 420. It is commonly used to cover up when one or a group are about to smoke and there is heat*(see "heat") around, such as parents, teachers, cops, and employers. If questioned, it can be easily covered up as slang as well. (downtown, etc.)
by JWJD December 7, 2006

by Craig Grove September 7, 2008

(Short for Donald Trump). Definition: A big fat American asshole, alternatively a big fat American cunt.
Whilst watching a naked American girl teasing on a webcam site: "Mmmm you're so hot baby, bend over and show me your dt!"
by Real Johnny Blade December 2, 2017

by Hayes killer July 6, 2010
