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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
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hammerhead shark 

The most bad-ass animal ever created
God: We need to make something great.
Angel: How about a shark that can beat the shit out of people without biting them, it’s called a hammerhead shark
God: That defeats the purpose of a shark but ok.

hammerhead sharking 

When a male closes his eyes while undressed and waves their member back and forth, like a hammerhead shark, in an attempt to locate their mate.
Freddy undressed, closed his eyes, and began hammerhead sharking to find Judy through electroreception.
hammerhead sharking by GZX959 December 29, 2015

The Hammerhead Maneuver

The act of splitting the head of the penis in half and then proceeding to just ram it in there
She loved when he used The Hammerhead Maneuver

hammerhead 

john is such a hammerhead
hammerhead by killajem6000 July 16, 2017

Hammerhead Syndrome 

A man or woman who has atypically wide spread eyes. Noteable examples include Uma Thurman and Bandersnatch Cucumberbunch.
That girl over there is super fine but has a serious case of hammerhead syndrome. No thanks.

Yammered 

A person or state of being consistantly blazed.
Yo my ninja im so fucking yammered right now.