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1. Fecal Matter, the contents of one's colon or rectum.

2. Foolish, deceitful, or boastful language, worthless, deceptive, or insincere. Pretentious, insolent talk or behavior. i.e. bullshit. Or one who engages in such behaviors i.e. a poser.

Often used in certain fixed constructions e.g.
To pull a Van Dusen, to drop a Van Dusen.
1. I'll be there shortly, gotta go drop a van dusen first.

2. Did you hear that guy who wouldn't shut up about St. Augustine? Jeez, what a Van Dusen.
Van Dusen by Kabouter Weasley March 7, 2013
Related Words
A basement boy afraid to leave the house.

Mistakes opinions for facts commonly
I’m a van dusen, Google me rn. The jab saved my family. That’s a fact.
Van dusen by Van Dusen February 17, 2022

van deusen

to figure something out after given unclear instructions
Person 1: Do you understand how to do this lab?
Person 2: Yep!
Person 1: You van deusened it! Wow!
van deusen by betaji123 June 16, 2016

vandusen 

When someone is a giant pussy, who Exhibits racism, idiotic behaviour, while having multiple freak outs a day.
“VANDUSEN! I heard you were taking shit”
Vandusen : “well I heard you smell like poo”
*gets headbunt*
vandusen by DrPhil.mybabydaddy September 15, 2019