Short for Molybdenum, has an atomic number of 42, (the true meaning of life, the universe, and everything according to Deep Thought, the computer from The Hitchhikers Guide to the Galaxy).
Oh, Mo, what would I do without you?
by m0llyBd3nim42 August 11, 2018
Get the Momug. 
A term used to describe someone (usually in a discord server) who is self-centred and biased when it comes to people. If someone is called a "Mo", they are usually considered to be unsympathetic and unable to look at other people's perspectives.
Person A: Man, I love encouraging a toxic community and doing whatever I like with my server members without considering its consequences and the demolishment of my reputation that will follow.
Person B: You're such a mo
Person B: You're such a mo
by Your Average BBB Member June 17, 2023
Get the Momug. Amy: Hey, Karen. Did you leave your jacket at church last week?
Karen: I did. Any chance you found it?
Amy: I didn't find it but I saw that Cooper fella hang it in the entrance area after I knew you had already left.
Karen: Cooper? Isn't he that 'mo who drives the purple Subaru Legacy?
Amy: I know. Right? Isn't he the wrong kind of queer for that? Maybe his wife is a 'mo too! LOL!
Karen: Let's be sure to pray for them both.
Karen: I did. Any chance you found it?
Amy: I didn't find it but I saw that Cooper fella hang it in the entrance area after I knew you had already left.
Karen: Cooper? Isn't he that 'mo who drives the purple Subaru Legacy?
Amy: I know. Right? Isn't he the wrong kind of queer for that? Maybe his wife is a 'mo too! LOL!
Karen: Let's be sure to pray for them both.
by FinelyThreaded February 8, 2023
Get the 'momug. by Abirbontheinternet February 22, 2022
Get the Momug. 