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Intimate relations between members of Model United Nations (known as "MUNdoes," (em-U-en-does)), of which there are three degrees:

Third Degree MUNcest: occurring between MUNdoes of different committees at a conference
Second Degree MUNcest: occurring between MUNdoes of the same committee at a conference
First Degree MUNcest: occurring between MUNdoes of the same school/program.

While first and second degree MUNcest are in fact smiled upon in many circles, 1st Degree MUNcest is widely frowned upon. Those guilty of 1st degree are to be subjected to friendly teasing such that the crime may never be forgotten.

There is also a legendary and unproven MUNcest with ones chairpersons. Many dismiss this to be mere folklore but experts claim it is theoretically possible. It however has not been worked into the degree system and is largely shrouded in mystery and conjecture.
Natalie and Jordan committed muncest,
Natalie muncested Jordan
MUNcest by Kris-Nigel December 10, 2003
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Amendment to above definition by Kris-Nigel:

"While first and second degree MUNcest are in fact smiled upon in many circles,"

should be read as:

"While SECOND and THIRD degree..."
Second and third degree MUNcest are in fact smiled upon in many circles.
MUNcest by Kris-Nigel December 16, 2003
Related Words
the act of dating/hooking up with another student in the Model United Nations program
MUNer #1: If you were a topic I'd table you.

MUNer #2: I am a topic. Table me.

MUNer #3: MUNCEST alert.
muncest by MUNLOVER123 June 23, 2010

mancestors 

ancestors who are male
"I can trace back six generations of aunts, but their husbands, my mancestors are missing...."
mancestors by will6691 November 19, 2011

Muncastergate

Originally Muncastergate was a term used to describe pleasuring ones self using castor sugar, whilst thinking of the clergy.

However, in more recent times has become a generic term for a Skoda Fabua.
Yesterday i caught Dave in the middle of a muncastergate!
Muncastergate by Anduz001 July 31, 2011

Munchstache

a mustache that is slightly bleached or lightened as a result of eating a substantial amount of coochie or one that just has acidic discharge
That dude must be an eater, you can tell from the light patches of his munchstache.
Munchstache by dorsosexy January 25, 2023
Any form of sexual intercourse that takes place between two men of the same lineage. The homosexual derivative of incest.
I heard that guy has mancest with his uncle.
Mancest by gaybelline October 20, 2010