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A skinny penis; sharp as a razor. Not allowed at airports, schools (unless under 5 inches), government building, stadiums. Must be registered with the ATF if model 69 or higher. If longer than 11.5 inches it is considered an Assult Leanis.
Jim: "What happened to Carlos?"
Tyrone: "You didn't hear? He was detained at the border for trying to pass with an unregistered leanis."
Leanis by Get away dad! February 27, 2019
Related Words

Leylanis 

One of the most witty, beautiful, and reliable girls you’ll ever meet. She’s smart and when you need advice you can always count on her to enlighten you with her opinion. She may have moments when she overthinks the little things, or where she may be a little clingy, but it’s all with good intention. She has a really big heart which leads her to forgive a little to fast. If you ever get to meet a Leylanis, I suggest you never let her go.
Person #1: Damn, she’s valid.

Person #2: Oh, yeah, that’s Leylanis.
Leylanis by Rosaax February 7, 2020
A bad ass bitch who gets whatever she wants and , a blunt person , hype personality
Have you heard of leyani she's a bad bitch
A penis of biblical proportions, biologically curious in that both males and females may possess a Leanis. The origins of Leanises or, 'Leanai', are genetic - one cannot be grown, it must be born. In ages nine and younger, a Leanis will present as a smaller, but still formidable 'Stundnis'. In time, and with proper nutrition, this Stundnis will eventually mature into a fully fledged Leanis.
Dave: Man you'll never guess what..
Mike: What?
Dave: Just found out my girl has a Leanis.
Mike: You lucky motherfucker. Hold onto that one.
Leanis by notamethhead May 24, 2013
1. n.
A penis longer than it is wide.
1. Did you see Joey's leanis? It's so thin, but it goes deep!
leanis by MBI May 3, 2005
Prejudice characterized by the discrimination of fit or lean people.
lardist fatorexia
They sent Bob to the counselors office for practicing leanism in gym.
Leanism by Wordy2 April 23, 2013