In Mexican slang, it means something like "insolent little douchebag", "absurd fuckhead", or "deliberately, and often arrogantly, uncooperative".

It's highly inaccurate to say it simply means "annoying person", "someone who does something stupid", or even "snob". It can be used to describe an annoying person since an absurd, arrogant asshole will of course be annoying, but annoyance is such a subjective and broad notion and mamón does not come close to encompassing it completely, so it's a flawed definition. Same thing goes for 'doing something stupid' or 'snob', and to these add the fact that there are slang words for each of those that are several times more fitting; like pendejo or fresa, respectively. Although it would be perfectly fitting to call a snob a mamón if he or she has the appropriate attitude, but not a simply someone who does dumb things since pendejo covers that.
- That little mamón thinks he's hot shit with all his little bullshit.

- I used to hang out with him but then he started being a little mamón.

- No seas mamón. No mames, wey.
by cerveza! December 19, 2008
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In Spanish, somebody who likes to drink/suck, also refered as a blowjob lover
Petinatto is a mamón, and his wife a mamona
by Anonymous May 10, 2006
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A man fond of sucking other men´s cock
Buen mamón busca macho con rabazo

Good sucker looks for male with big cock
by fonsucu June 12, 2008
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It literally translates as " Fucking Stupid ". It can also be in a joking manner or just a mean insult.
Guy 1: Your a Jerk dude.

Guy 2: ¡Eres tu Pinche Mamón! ( You are fucking stupid!)
by Dragonverde August 14, 2018
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