Combination of Mud and Poop (M-oop). Used by farmers and ranchers to describe the manure slurry that occurs after a heavy rain or melting snow in livestock paddocks.
by DutchHollow March 9, 2018

by Dr cherry blossom April 10, 2021

Urban Dictionary
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Moop
Moop is very accurate yet derogatory term for half wits with gigantic noses and a very large vaginal area. They tend to be horrible at fantasy football and hold their alcohol about as well as 70 lb 12 year old girl who had a cracker for lunch.
If you ever see one in the wild they may answer to Guido, Dan the Can, Mangina, Manweenie, or Gonzo.
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Moop
Moop is very accurate yet derogatory term for half wits with gigantic noses and a very large vaginal area. They tend to be horrible at fantasy football and hold their alcohol about as well as 70 lb 12 year old girl who had a cracker for lunch.
If you ever see one in the wild they may answer to Guido, Dan the Can, Mangina, Manweenie, or Gonzo.
The moop is puking in the bucket.
by Websters Dicksionary September 12, 2020

“you fucking virgin moop!”
by framy October 9, 2023

by Bananarama R. April 9, 2015

by Kool-Koder64 May 18, 2023

MOOP is an acronym for “Matter Out of Place”, a convenient way of referring to anything that is not originally of the land on which our event takes place. So everything that wasn’t originally on or of the Black Rock Desert, no matter how small, is considered MOOP, and is to be removed as part of our Leave No Trace efforts. MOOP also includes greywater, and the particulates contained therein.
by Teta71 March 5, 2024
