The usage of a previously used condom by either unrolling and flipping it right side out or putting it on inside out.
I'm out of condoms.... gonna have to dirty hat this bitch.
Having sex with 3 different women in a day separately, without washing off in between.
Guy 1: Hey man, what did you do this weekend?
Guy 2: I did a Dirty Hat Trick this weekend with Sandy, Stacy, and and Amber.
Guy 1: Dude! That's nasty but awesome!!! Hope they don't talk about it and find out!
Guy 2: Yeah, right? They all blew me, too. Haha!
Guy 1: Gnarly!
jock; typical in young north eastern sports fans. also enjoy dave mathews band. can find a dirty white cap at a keg party or using the term "bra" instead of "brother" also enjoy wing night at a local bar on monday nights.
the Dirty White Hat joined a college Frat House.
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When one has vaginal intercourse with at least three women in a day without washing his penis.
(Is generally abbreviated to DDHT)
Friend #1: Last spring break I totally pulled off a DDHT!
Friend #2: Dude, what's a DDHT???
Friend #1: The Dirty Dick Hat Trick bro!