A mathematical function where the output is the opposite sign to the input.
A simple Lewisian function produces the negative of its input (-5 => 5, 5 => -5).
A more complex function that returns any real but conforms to the same sign constraints is also a Lewisian function.
A Functional Weeaboo is a Weeaboo who is able to blend into society and hold back overwhelming weeaboo tendicies.
Johnny is the only one in the weeaboo group to be a functional weeaboo, he keeps his grades up and has a girlfriend.
A person who is obviously weird, strange, and does retard-like things, but is a fully functional human being, or whatever species they are. Usually they are assholes, but they're usually enjoyable and funny.
Example 1)
*Gonzo screams "Dick Waterfall" in the middle of an instructional period*
Jessica: What is wrong with that man
Amber: I don't know, but he must be a pretty functional kind of retard.
Example 2)
*Actual disabled child walks by*
Jessica: He's probably not a very functional retard
Amber: Dude, that's my brother.
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A person that is a nerd but unlike most nerds does not lack the necessary social skills to interact with non-nerdy people in a nature way.
Bob: Wow Ian is such a nerd.
Alina: Yes but at least he isn't awkward to be around. He's a functional nerd.
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A functioning crackhead is somebody that is able to hold down a job and maintain a "normal" lifestyle while on crack, without completely sucumbing they're life to the drug.
Guy 1: For a hype, that dude sure has a decent house and job.
Guy 2: Yeah, thats because he's a functioning crackhead
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A person that can have many drinks, become drunk, and still function perfectly normal. It's hard to tell whether or not this person is drunk unless you ask them to recite something.
Girl: I was so drunk last night but I had a normal texting conversation with my boyfriend.
Other girl: That's weird but you might be a functional drunk.
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a worthless yet admirable person who can drink everynight and still pull good grades in college or act as a normal person in a work environment.
that bitch drinks every f'n night and made a better grade than me on the test.
Or:
i saw that douche torn up last night and today he acts like mr. super employee. wtf?
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