Lepton 

fool, halfwit, dolt, ignoramus, imbecile, simpleton; A slur for those not as intelligent as you are—used particularly by those who are highly intelligent prodigies for those who are not.

From the movie "Little Man Tate" where Fred uses the term "Lepton" to refer to others who aren't as intelligent as he is.

"Read a book, you lepton." is borrowed from a Patton Oswalt bit.

Lepton by nimrodthesaurus June 1, 2016

Lepton 

One of a group of subatomic particles including the electron and neutrino. Leptons, along with quarks, are currently thought to be the ultimate building blocks of nature.

There are six different types of quarks and six leptons.

Lepton by OneBadAsp October 22, 2006

lepton 

Z particle. Smaller than protons and electrons.

Woman: What did you just call me?
Child: A Lepton
Woman: What the hell is that?
Child: You wouldn't understand.
Woman: No, speak slowly..
Child: A lepton is a Z particle.
Woman: So?
Child: Do you know what protons and electrons are?
Woman: Yeah.
Child: OK, what are they?
Woman: They're those teeny tiny things atoms are made out of.
Child: Well, leptons are even smaller.

(Shakta - Lepton Head Pt. III)

lepton by Dracus December 20, 2003

lepton 

lepton n. (Brit.)(slang) pl. leptons

A mythical measure of velocity used primarily to describe how fast you were travelling in a car. Typically one lepton may or may not equal 10mph or 100mph or 2.734295mph.

Used so that people can post in the public domain how fast they were going, but due to the use of the mythical unit, proof of speed for prosecution purposes is unlikely by law enforcement.

The other day I managed to drag off a Porsche, he stayed with up until about 15 leptons I began to leave him behind.

lepton by Esprit September 12, 2007

Lepton 

Someone who is being rude, offensive, or insulting to you. A small person

Lepton: Hey, maybe you shouldn't sing in front of people
You: (*begins crying*)
Your friend: maybe you should stop being a Lepton

Lepton by Yeper May 19, 2016

Leetoner 

Always fucks up.
Everything he touches turns to shit.
Is usually stoned.
He has a medically diagnosed micro penis.
A complete bell end.

He's fucked up again, he's done a Leetoner.

Leetoner by Gundi Gumnut October 15, 2015

Lextonian 

Someone who lives in Lexington, KY

I live in Georgetown but I wish I was a Lextonian

Lextonian by Queen._.Bee January 10, 2017