Adendum 

A brootal(!) Death-core band from Tampa, Florida. The most brutal-est, most hardcore-est, most awesome-est band ever to walk the face of the Earth. They are notorious for their 70+ minute song, consisting of Spanish gypsy scales in the key of C-major. Most of their song typically talks about how tight their clothing is, and how it causes them constant suffering and torture, and about how they regret that they forgot to add the "D" in their name to get an actual word.

Brootal Boy 1: Hey dude, why are you called "Adendum"? Isn't it supposed to be "Addendum"?

Adendum Band Member: Son... I am disappoint...

Adendum by Brootal Fan #2 April 24, 2010

addendum 

Something that is added or later to be added, e.g. a supplement to a book.

"I decided to add an addendum to my novel after I'd finished writing it."

addendum by Brendan Sinclair December 28, 2005

Addendump 

When you take a crap but five minutes later have to go back because you walked away too early.

"I rushed my bathroom break because I was running late, but five mins later had to file an addendump anyway."

Addendump by Ultimate Stink November 24, 2020

addendumb 

A useless, nonsensical, or pointless addition to something. A non sequitor.

Oh. As an addendumb to our discussion about coffee. Did you know that polar bears prefer tea over coffee?

addendumb by SJ@24 July 18, 2009

Sock rule addendum

As the true creator of the rule not like the imitators, i’d like to clear some things. First thing first wearing 1 sock doesn’t change anything it’s still gay, that’s the law. Second thing, all those who claim to be the true creator are wrong I created this rule back in 2013 as a joke with my friends. I posted it back in 2018 to stop people from claiming it and changing the rules. So remember keep those socks on unless you like cock! Love- no socks

Sock rule addendum. It’s gay if you’re not wearing socks. See Sock rule for further clarification.

Sock rule addendum by No socks November 9, 2021

addendumed 

When something has had an addendum, it is said to be "addendumed"

John made an addendum to that article. He addendumed it.

addendumed by gerardb38 February 8, 2010

amendum 

An addendum (an added statement at the end of a document) that is at the same time and amendment (a change to a document. More specifically something added at the end of an email or text that fixes or clarifies an earlier statement.

Rob: Michael is a twat.
Mike: No I'm not
Rob: I'm just kidding. Please except my amendum... Michael is a huge twat.

amendum by robbitybob June 7, 2022