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n. a crazy person, especially someone who purports to be a scientist or inventor who has discovered the answer to some important problem facing mankind, like curing all diseases, unlimited energy, levitation, aliens, etc.

He defends his claims with the most ridiculous pseudoscientific crankisms, and claims that the government/mainstream science/experts are suppressing the truth.
Sometimes cranks are businesspeople, selling such wares as Q-ray bracelets that align your chi using q ions to give you enhanced energy.

Probably the best known internet crank is Gene Ray, for his Time Cube site.
crank by Khashishi May 29, 2010

crank that flight 2074 

when you're on a flight and you see a girl who is sleeping with an empty seat next to her, you slide in next to her and start masturbating and ejaculate in her hair. she will file a $200,000 lawsuit against the airline.
i did a crank that flight 2074 on dis chick and now american airlines has to pay out 200k

Crank That Lincoln 

When a guy is doing a girl from behind, right before he ejaculates, he pulls out and squirts at the back of her head. A reference to abraham lincoln who got shot in the back of his head.
One night I was so annoyed with sally I thought it would be funny if I crank that lincoln without her knowing.
Crank That Lincoln by Todd MacGuire December 29, 2007
Somebody you know that’s weird as fuck and crazy.
Guy 1: Bro you know that girl Sophie?
Guy 2: Yea what about her?
Guy 1: Yea she tried to bite my dick off, what a fucking crank.
Crank by Yurbo December 2, 2021

crankypants 

A person who is cranky on a regular basis over stupid things. They are not angry, just cranky.
My boss can be a real crankypants.
crankypants by Janet S. July 22, 2008
Meth Addict word (like Stoner is for Marijuana)
Any Person that does Meth is a Cranker
Cranker by CoasterDrugs February 17, 2012