Someone who will not hesitate to stuff an object into your rectal cavity
bro1: so what was the outcome, what did the doctor say?
bro2: Maaaaaan, he stuck his finger up my ass and said you've just been Duncan'd..
bro1: that's deep
by WhoaPlayer December 13, 2018
Get a Duncan mug for your daughter-in-law Yasemin.
Duncan comes from the Latin word douch. Someone with the name of Duncan is usually quite lame and tends to not pull many birds due to their terrible looks. They mostly like to go for girls on the other side of the world so they know they won’t ever have to show their ugly face.
Duncan’s are the most popular in UK broffles so they tend to spend most of their money there until they are skint.
“Look at that Duncan over there crying because he lost all his money on that prosi 😂”
by OfficialDefine00 May 20, 2018
Get a Duncan mug for your sister Riley.
Bob duncan a majestic creature and is just as beautiful as cole Sprouse he is a bald beauty.

My and my hobo toe love u bob duncan
Me:bob Duncan's new name is bobbi boi
My friend:no no no it should be daddy duncan
Me:troom troom
by Hehe bob duncan November 04, 2018
Get the Bob duncan neck gaiter and mug.
Bob is the hottest man alive. He was the best father ever and after his weight loss the other guys didn’t stand a chance. 10/10 beautiful man.
Bob Duncan is hot.
by im helpful May 24, 2018
Get a Bob Duncan mug for your brother Callisto.
The phenomenon that causes females to be inexplicably attracted to a random male, like moths to a flame. The art of seduction, commonly referred to as "The Duncan theory'', can have a tremendous effect on the victim.

Also known as "The Duncan Theorem"
The inexplicable phenomenon that causes females to be drawn to a single male (The Duncan) in droves.

The strength at which females are attracted is equal to the grade of symmetry of his face multiplied by the pitch of his voice, and reversed to his age divided by the concentration of his natural pheromones.
I lost my gf due to some guy named Duncan. I swear he just looked at her and she instantaneously became overwhelmingly wet... Hashtag The Duncan Theory

That new Duncan kid looked at me today, I felt a strong magnetic force pulling me closer to him, as my knickers got wet, he spoke "Hey Jenny" ... I swear to god I almost exploded #TheDuncanTheory
by Dawie's Suicidal Unicorn August 04, 2014
Get a The Duncan Theory mug for your friend Julia.