A Mamón is a ridiculous guy who is either a total mama's boy or a poser who makes empty, exaggerated boasts. It is distinct from mamador, which refers to someone who literally sucks or performs oral sex.
'I have big money. Oh, and did you know Angelina left Brad Pitt for me? I am a simple guy, I dance tango, rumba, salsa, whatever you want.' This idiot is a Mamón.
A poser who brags about things that are not true, or someone who talks nonsense. (In Mexico, it is often used for people perceived as stuck-up or full of themselves).
A: See that girl who is so pretty and hot? She is my girlfriend. B: Do not be a mamón. That girl does not even look at you.
In central Colombia: A pain in the neck or a total drag. Someone who is very annoying or tiresome because they keep doing the same thing over and over. (In this region, Mamón is synonymous with being bothersome or pesky rather than being a wimp or a sucker).
A slang term for a blowjob, used almost exclusively in sexual contexts.
Someone needs a favor from another person and they are asked for a mamón in return, meaning they have to perform oral sex in exchange (you do not have to be gay to ask for a mamón: in Dominican culture, only the person who performs the act is considered gay).
A term used for a brown-noser or a suck-up: someone who constantly flatters people, usually those in power, to get what they want. (In Venezuela, it is a synonym for the vulgar term jala bola).
This guy is such a mamón, it is so annoying. / Gabriel is being way too much of a mamón with the teacher.
In Mexico, calling someone a Mamón is an insult. It describes someone who is stuck-up, conceited, and obnoxious: a person that few people can tolerate. (The term güero refers to a fair-skinned or blonde person).
"You are a Mamón, dude." "That blonde guy is a Mamón, we better not even invite him."