A person who is heavily intoxicated to the point that his/her eyes deviate away from their head (much like how a hammerhead shark is)
Dude, you were so hammerhead last night!
by HurricaneGordon November 19, 2009
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A person who enjoys eating out excessively bloody assholes. They typically bite off small chunks of flesh in the process, adding to the bloody carnage.

Hammerheads usually perform this action in groups as part of a "feeding frenzy."
That hammerhead is eating mad time asshole! Look at all that blood!
by UsedDinger October 23, 2013
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Term used in the cycling community for a really gung-ho athletic rider, the kind with an intense training regimen and a "need for speed." Named for their habit of dropping the hammer, or launching into unnecessary bursts of speed, particularly blowing off weaker riders in recreational group rides. In extreme cases, they've been known to blow off traffic lights and laws just to go fast. Too often matching the stock image of the athletic, lycra-clad scofflaw, they're often blamed for perpetuating a lot of ugly stereotypes about people on bikes.
"I get to the intersection on my bike, and just when I get the light, some hammerhead blows off the intersection right across my bath! He cuts me off, AND all those cars. Then they all start honking at me, even when I signal properly, because they think I'm a jerk, too. I'm just trying to get to work!"
by The Urban Husky October 30, 2011
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A drinking game for the boys. Involves two pong games going on simultaneously on two tables shaped like a hammerhead. One table is straight and the other table is faced sideways connected to the first table. The game that involves the long table involves cups 4-3-2-1 and is 2v2. The short table is 1v1 and has cups 3-2-1. One team from long game and short game are on same team. First team to eliminate all cups wins.
The boys played hammerhead last night. They were super ducked up.
by Rik April 23, 2017
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A shit so large it feels like the head of the hammer is coming out of your ass but then tapers of nicely for sweet relief.

Practicing lamaze techniques during this process if helpful.

WARNING:
The hammerhead can cause bleeding so don't be alarmed.
Now I know what having a baby feels like, I just dropped a hammerhead in the bowl.
by SavedByZero July 20, 2009
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A failed attempt at a Land Shark (See landshark definition)
"Dude me and this chick tried to landshark last night, but I missed the hole and totally ended up with a hammerhead"
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A way to label someone who’s eyes are incredibly far apart. Typically as a result of a birth defect.
“Hey Chad that girl behind the bar looked cute as fuck tonight”
“Bro did you see her face??”
“No, why is she pretty bad?”
“She’s a complete hammerhead dude”
Oh fuck, gross”
by DefinitionMaster69 September 18, 2020
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