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Exactly like cancer, only dull. Inflammation of the dull. Terminal dullness. Dullardry inherited and manifested. A disease of the dull.
Man, how can you live in that leper colony?

-Leper colony? No, it's not a leper colony, it's an internment camp for foreigners who were swindled out of their money and herded into the worst apartments possible.-

Uh huh, yeah it's a leper colony.
-No, no one has leprosy, there's government agents watching the foreigners, and they're on this mission because they have dullcer-
dullcer by Crunchy Shitburgers July 28, 2009
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teeth dullers

Before the march a day's ration of teeth dullers (hardtack) was distributed to each soldier.
teeth dullers by talk2me-JCH2 July 25, 2022

Dullerhalo5842 

A Dullerhalo5842 is a God like creature with a gigantic cock. Sometimes extending miles when aroused. Dullerhalo5842 is of the Arian decent, he is of the latest generation of the most effective form of human being. When compared to powerful beings he is on another skill list overtopping any and all other big dicked kiddos. The only other being that would come close to him is Ron Jeremy yet still miles behind. (Pun intended)
Girl 1: OMG! is that uhh uuhhh oh fuck me I getting fucked so hard in the ass holy shit my ass is splitting in half!

Ugly Girl 2: holy shit your ass just got split in half! Thank god I’m ugly.... Ouch uhh oh fuck he doesn’t care if I’m ugly Oh No!! Ouch uhh aaaaahhhhhhhh!!!!!!
Dullerhalo5842: That’s right I’ll fuck anything and everything! Believe it!
youre such a duller
duller by cooldooddd November 15, 2015

adam duller 

a person who enjoys roleplaying dungeons & Dragons games.
that dude is a real adam duller; get your head out of your adam duller
adam duller by hugh jelbow May 26, 2009
Dullers are grey humanoids in the Backrooms who can noclip through walls.
Dullers noclip through walls as a hunting tactic.
Duller by MaybeARealWord January 12, 2022

duller than a dildo 

A simile used to describe the sharpness of a knife or cutting tool by comparing it to the sharpness of a sex toy.
Did you sharpen this knife with the rubber? It's duller than a dildo!
duller than a dildo by 15thtexas1 September 11, 2023