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Since the overused LOL has become cliched, UCM is making its way in. Literally, the acronym is short for "Unexpected Chuckle Moment." UCM should only be used in moments where one actually bursts out in a chuckle, ideally in surprise.
Alice was in her boring work meeting when she read an email from her sister, causing an unexpected - and unwanted - giggle. She responded with, "UCM! I couldn't hold it in!"
UCM by almoagnadna December 19, 2008
Related Words
-ily, ucm <3
-ucm <3
ucm by Swoysher April 12, 2011

UCM_SEARCH_TERM 

Some random ass shit that pops up when you have a shitty ass search bar that sucks penis
Hold up let me search that Kate, *goes to search* lets see what we got.... UCM_SEARCH_TERM Are you fucking kidding not again
UCM_SEARCH_TERM by Itsyoboi June 20, 2014
Universal Concept of Mental Arithmetic System (UCMAS) is a modern representation of an ancient art of mental arithmetic that has been adapted into programs to help stimulate children's brain activity, how does the Abacus work?
UCMAS technique uses the UC tool – the abacus; which trains students to develop their brain and gives them a unique way to do fast calculation, students are trained on the finger technique and formulas with which they work on the book pages using the physical as well as mental abacus. How many levels are there in UCMAS? UCMAS program consists of ten levels. Level 1 is the Basic level, and level 10 is the most advanced.Though, Abacus can be learned at any age, the obvious benefits are seen when a kid starts learning abacus during early years of education.The training takes approximately 3 years to complete (each level is 3 months). what age can you learn in UCMAS? Though, Abacus can be learned at any age, the obvious benefits are seen when a kid starts learning abacus during early years of education. It is important that the student can count upto 100 prior joining for Abacus training. Considering this pre-requisite, Abacus has been taught all over from the age of 5 or 6.
"I have UCMAS at 4:00 PM"
UCMAS by Sultaco123 September 6, 2021

UCMJ says 16's OK 

A phrase used for a military person who wants to have relations with a person who could possibly be under age but the UCMJ says as long as she's 16 its fair game.

Also can be used to combat the phrase 16 will get you 20
#1

Sailor: Hey check out that girl over there she is fine as hell i would destroy her pussy

Marine: Dude she looks 16 years old

Sailor: Hey UCMJ says 16's OK

#2

Guy 1: 16 will get you 20

Guy 2: Yea but UCMJ says 16's OK
Mia essex is a ucmong
ucmong by Fanny shagger innit November 30, 2022