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A Yiannis is a "pimpin" Greek male. A Yiannis is the coolest person you will ever meet, so treat them well and do as they say.
Damn girl, did you see Yiannis? Holla.
by Sixty Four February 06, 2004
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Jul 15 Word of the Day
The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.
Billionaires are having a dick swinging space race while the earth experiences record breaking heatwaves that cause sea creatures to literally cook inside their shells. We need planetary quarantine.
by monkeylabor July 14, 2021
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2
Some guy who is has the best laugh and is always there to make you smile.
Guy: Have you've heard Yianni's laugh?
Other guy: No, why?
Guy: You're missing out!
by yians2034820 November 14, 2019
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3
A Greek name, usually for a strong, handsome male.
Yianni's usually play the bass, but have been known to play the pan flute on occasion (see: Yianni: Master of the Pan Flute).

Full of knowledge, and is secretly a ninja. (but don't tell anybody, its all very hush hush).
Guy: "Hey Yianni! What ever happened to your dream of being a ninja?"
Yianni: *Nods head, smiles, and walks away to save the world from a threat they didn't even know existed*
by panflute February 03, 2010
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4
Yiannis-Greek male- Sweetest guy, cute, smart, and funny. Love talking to Yiannis. Best guy ever.
i t yjr nrdy
by what isnt my name May 26, 2004
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5
To pull a 'Yianni', when something unexpected happens and results in a positive outcome.
See pool, when a player aims for one pocket, misses and it ends up in another, this would be called a Yianni.

A player will never admit to pulling a Yianni but will always claim it as skill.
by coehlo December 21, 2009
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