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Short for Model United Nations, or Model UN. One of the worst clubs to join in highschool, very cult-like, would not recommend
Matt: “Yo I just joined that club MUN”
Sarah: “I heard Model UN is hella weird”
MUN by mshahonlydubs April 1, 2023
Related Words
munch Munt Mung munter munchies munted munchkin mun Munk munge
Look at that guy's mun! He is so fine.
mun by Tevs April 19, 2015
From Sydney Church of England Grammar School SHORE

meaning 'as if', if a person is lying then you could say mun, as in that person is being a bit of dick and making shit up
Nic: I'm a heaps good skater

Mike: Mun you're a pro skater
mun by lilwhitey December 1, 2010
Short for munjang in native aborignal, used for the ect of feeding some shiela a length
As your walking past two people making out "mun her!"

Knocks on the door "are you guys done munning I left my jumper in there"
mun by raebo February 21, 2009
A miseruble little pile of secrets.
"Munkind ill needs a saviour such as you!"
mun by CZeke March 31, 2009
Irish - short for Ballymun.
Notorious Run down high rise area in Dublin, near the airport.
That fucking dirty knacker bastard from the mun isnt gettin a job here- they should knock down those flats and leave the fucking scumbags in them.
MUN by womoma April 15, 2005