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An anus that is covered in a thicket of dirty hair.
Dude: Did you see how hairy his ass was when he bent over?

Other Dude: I closed my eyes, but it sounds heinous.

Dude: Yeah, a big ol' hainus.
hainus by eplane September 15, 2012
Related Words
An adjective that describes how kickass something is. Something that is hot shit or even a hot cake can also be identified as hainus. People who are hainus are people who kickass.
-dude your mom is hot
-so, yours is hainus!
-oohh....
hainus by Justin Merk January 20, 2004
It's a combination of Hina-chan and pussy in which is said in 393235 on page 14 by Hina-chan's Onii-chan.
Onii-chan: Can I cum inside? Is that what your Hinussy wants?
Hina-chan: No it's NHAAT! And don't call it a "Hinussy"!

Lachlan Haines 

His origins go way far back...

Born in a poor beaver family with half human half beaver DNA, he grew up learning that one day he will learn how to master his Frontal Teeth and defeat the Fire Nation... Some people believe that his teeth was able to carve the rock from the backside of a large Mountain. This boy will soon grow up and become the most retarted person on earth...

Even though he saved everybody's lives...
dude that story was deep, like Lachlan Haines deep... *Yoinks*

where are you scooby doo
Lachlan Haines by PhotosynesisMan August 19, 2019

Stupid Haynus Syndrome

An extreme mental and physical disorder, the chief symptoms of which are delusions of grandeur, extremely low intelligence and stunted growth. It is incurable and thankfully very rare.
Doctor: "I'm sorry, your son has been diagnosed with Stupid Haynus Syndrome. You may wish to consider putting him up for adoption"
Stupid Haynus Syndrome by Dr. Jiub November 5, 2011
Big Guy, Big man, Big so big, at least 7ft tall big. The sexiest man alive Big D. Can shoot 3 pointers with ease, always asks to be in group chats because of "Fomo". Such a big guy.
Person 1: You know Haines?

Person 2: Yeah ofc who doesn't know the biggest and sexiest man alive.
Haines by BigGuyBigMan February 25, 2021