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A yammo can have a few different definitions, depending on context. In general, it is used to refer to a person who is or is acting like an idiot, fool, moron, dimwit, simpleton, tool, lunk head, asshole, jerk, etc.
That guy almost cut me off! Fucking yammo!

I can't believe he didn't know her name was Mulva. What a yammo.

Don't be such a yammo - VOTE.
yammo by girljme June 14, 2018
Related Words

yammer butt skeezer 

an girl that is a skeezer/whore who is also an asshole that talks too much shit.
Travis: Hey did you see Lana? I heard she slept with the whole basketball team.

Jesse: Yea I saw her she's always talking crap. She is such a yammer butt skeezer

Yammed On 

An explanation of a brutal dunk in basketball that involves the dunker to drag their nuts across the face of the person being dunked on. Usually an unexpected dunk to finish off a game or to outright disrespect the opponent.
Did you see Etty and Neo play on the court last Friday?”

“Yeah Neo brought the game to 21-3, she got yammed on”
Yammed On by Master Of Shadows November 25, 2017

yammer on 

A description of when someone just can’t seem to shut the fuck up.
When it comes to the capacity to yammer on without ever seeming to need to take a break or a breath, he takes first place in that competition!
yammer on by Dr Bunnygirl July 3, 2021

James Yammouni 

When I think of James, the first thing that pops into my head is beautiful. He really doesn't notice how beautiful he is and how much people think he actually is. There is no reason to hate on this boy because he doesn't deserve it. He is human and every human is beautiful INCLUDING JAMES.
Person 1; Who is one of the most beautiful people in the world?

Person 2; James Yammouni of course!
James Yammouni by his wife October 5, 2012

yammerhead 

n. Synonyms: douchebag, blowhard, blackguard.

An annoying person who has little common sense. A waste of space. An arrogant person who has no talent.

The word is used repeatedly in the novel "The Moon is a Harsh Mistress" by sci-fi master Robert A. Heinlein
A yammerhead is:

1. The obnoxious guy sitting in the next table over at the restaurant, calling the waitress every five minutes because his drink is too warm, he does not have enough sauce, and the steak is a tad undercooked.

2. An idiot who objects to agreeing a proposal by unanimous consent because he wants to hear "debate," which is "essential in a democracy."

3. There is at least one in every room. If you cannot find him/her, then you are it.
yammerhead by Robert Heinrich September 28, 2008