1. One who constantly cancels appointments, meetings, and friendly gatherings.
2. An acquaintance that constantly fails to follow through on a prior arrangement or obligation.
- Derived from the term leprocy. Leprocy is a communicable disease that causes lesions to the skin and disfiguring of organs. This is followed by flaking of the skin. Flaking is used in direct correlation with leper.
"Mooney is such a Leper! That is the third time in a row we were supposed to hang out and he never showed up!"
"I had talked to Mooney two times yesterday on the phone and he was supposed to meet me here two hours ago! What a leper!" (a similar word is Flake)
by BeaverJon February 2, 2007
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(noun) - A (typically highly educated) professional working in the United States due to scarce technical skills and in spite of a a deeply Limited English Proficiency (LEP). This is a very common malady in technology companies, university science and engineering departments, and government agencies that import significant portions of their workforce
Our electrical engineering department is just full of LEPers. Nice guys, and you can get lectures in circuit theory in any of 5 dozen asian languages, but there isn't a damn one of them that can hang together two English sentences.
by Frustrated_Monolingual August 4, 2009
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Whilst having sex with a girl keep a sausage (raw or cooked) in your hand. After a few minutes remove your penis from her as you shove the sausage inside. Tuck your penis between your legs and scream. As she turns around she will still feel something inside her but it will look like your penis is missing.
This is called The Leper.

Bonus points for adding ketchup or fake blood for extra realism.
'I'm going to have sex tonight!'
'Make sure you do The Leper, here, take this sausage.'
'You're a great friend.'
by The 413 August 26, 2012
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Root: Limited-English-Proficiency-er One who does not speak enough English to be comprehensible, particularly on the telephone.
Before Sharon got Caller ID, she frequently had jagged and partial conversations with many a leper trying to get a hold of the immigrant who last inhabited her new home.
by Kate Thompson For Real August 16, 2008
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1.For the use of lesser words; the slang use for a "crankhead"

2. One who tries too hard in life to be cool, knowingly knowing that they aren't but somehow pretend they are.
Man that dude with the shades on in the club is a leper.
by Breezy F. Baby August 12, 2007
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A killjoy that sucks all the fun out of life with their pretentious, politically correct bullshit and find every joke offensive. Usually a miserable dolt with zero creativity and sense of humor, they infect their hosts and surrounding and destroy any chance of a good time.
Wow! I didn’t know that Dave was such a Humor Leper, you can’t crack joke without getting a lecture from him, leave him home next time
by Lord evil May 23, 2013
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The designated smoker's areas outside of office buildings or in airports.
I hate walking by the leper colony in the morning...it stinks!
by Zenanarchy June 17, 2018
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